Solid (rigid) is good, but heavy is not. You should generally aim for low mass.
You could consider adding Naim style glass shelves on steel ballbearing supports as used in Fraim for additional isolation.
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I spent a lot of time experimenting when I was designing my own cabinet/rack.
I found ridgidity designed to suppress the whole cabinet most important. (too much detail)
But to be honest since I’ve moved on from a Rega TT and CDX2, I’ve found the ‘solid state’ boxes are not improved by anything re isolation. I tried the NDX on the cabinet top with glass & balls and iso feet of various sorts but all did nothing that I could detect.
If I were you I would concentrate on the Rega (assuming you’re planning to keep it) and a wall shelf is the best by far.
Have an experiment with the 222 mount and look at ways to separate the 300 and 250.
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Likewise, that’s how I feel too 
Some thoughts for your.
-
Add a shelf
Maybe ask a cabinet maker to add more holes down the inside of that space. Add another shelf, so three items can be used, each in its own level. -
Isolation
For further isolation, maybe use a local glass merchant and make three separate glass shelves ( same size as the Naim pieces ). Using 10mm Pilkington toughened safety glass. Then place into wooden shelves using Naim Fraim cup and ball arrangements ( for isolation).
By the way, love your cabinet.
Please share a wider photo, to show more of the whole furniture piece. Thanks in advice.
Best wishes
R
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I use glass shelves, 10mm I think on Naim ball and cup supports under my NDX/2xHicap/250 with a Base 01 platform under the 82. The wood shelves are adjustable, it’s a compromise but it all sounds very nice. The LP12 is on a Quadraspire stand spiked through to the concrete floor in the central section.
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When I used a cabinet with side pins to support the shelf, I applied cut felt pads on the underside of the shelf.
Between the pin and shelf. This gave a bit more compliance without any rocking.
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I guess some of the answer depends on DIY or not.
To start with, a long read, Vibration Isolation / Support for Glass
Then @MaxBertola refers to Ikea, I guess the Lack table, historically the support of choice for an LP12. If you have ever played with any of the Lack hacks from the internet, the light rigid top is a cardboard honeycomb between two sheets of fibreboard. But, this is probably too thick for the space in your cabinet? There are lots of honeycomb boards available if you search, except getting domestic quatities is not easy.
I ended up buying 10mm boards from Great Arts, 2mm ply from Lathams, bonding a five layer sandwich with spray contact adhesive.
Making a frame to mount them on, I will leave to someone else.
There was a thread a while back on this subject. This links to the thread and my post:
Some years ago, we compared boxes on my ultra-heavy granite rack to the same boxes (sensibly spaced out) on the wooden floor (or an old Apollo rack or some old telephone books) and compared some rubbery feet from HRS to the standard Naim feet.
With the HRS things, the sound was best and equally good in both places - no difference that any of us could hear consistently, either immediately or over a few hours. Standard Naim feet on my rack was fractionally less good, and standard Naim feet on the wooden floor (or anything else tried) was less good again.
Much more important, all these gaps were really marginal. We don’t think we imagined anything, but whether any of it is worth having something that looks noticeably less good to you is at best debatable.
FWIW, on another occasion we tried putting Naim balls and glass under my LP12 to try emulating some features of a Fraim. It was not good, whatever we tried under that.
By contrast, putting almost any turntable on a proper wall shelf makes a huge difference to SQ (even compared to the top of a good rack in at least some cases) and avoids bouncing needles.
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That’s roughly what I was thinking.
Good to know it’s a solution that can work. Thanks for the pic!
Yes, that’s basically what I’m thinking.
It’s actually harder than you might think to add more adjustable shelves. They need to be bang-on accurate, and it’s quite hard to do that properly after the furniture is assembled. Especially this one, because the pins have a brass bushing as well.
Here’s a wider pic.
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Thanks for the helpful replies everybody.
I have the equipment to make custom shelving to go inside. I make fine furniture as a hobby. I designed this one, but had someone else make it.
Instead of simply adding another shelf, There’s enough space to build a small frame, with tempered glass with ball and cup supports. If there’s an advantage, I’ll put the whole frame on brass spikes on top of a disc/plate to receive the spike.
Good advice on the TT as well. Right now, I’m most interested in getting a good system for the the digital stuff. TT has a Dynavector 10x5 (high output MC) to a Trichord Dino II phono. It sounds fantastic already. Upgrades there would be better power supply for the phono stage and TT, and a wall bracket. I used to have a wall bracket for it.
I’m not certain I’m going to keep it the TT. I may upgrade to something better, like a vintage Linn LP12 (or a new one for that matter). If I go down that road, I would probably make my own wall bracket, and treat it as a piece of furniture. 
That’s a whole different thread though!
I see there’s a huge rabbit hole about types of balls… I’m determined not to go down that hole. If I’m gonna anywhere near that direction, I might as well design something custom, probably in brass, and have my machine shop fabricate the parts… Looking at the depths of the rabbit hole, there’s probably a market for such parts!
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+1 for the suggestions to (1) have your furniture maker add one more shelf to give every box its own shelf and (2) get a trio of Naim cups and balls and a sheet of 10mm toughened glass for each level.
If the Naim cups and balls are unobtainable or too expensive, you can get very good results by combining appropriately sized ball bearings and machine nuts. Search this and other fora for ball nutters (a very popular tweak 10–15 years ago).
For what it’s worth, I’ve found that seemingly minor tweaks to your support system will bring very worthwhile benefits in sound quality. Not so much “extra octave of bass” audio fireworks, more the sense that you’re listening to music rather than a system reproducing music, along with a reduction in listening fatigue.
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Been here many years ago
You have an open back - and a solid wall behind??
Maybe consider fully opening up the back
Take the middle shelf out - you now have a big box that you are looking at
Carefully mark up the wall for the shelves you need but be careful - not all shelf supports measure the same/have the same dimensions once fitted to a wall - you might run out of room and still only be able to get two pieces in!..and remember not all walls are vertical…you need a 3D mindset here
Remove cabinet away from wall
If its solid, use Fisher bolts to hold new shelves in position - material as you wish plus Naim ball bearings and cups and maybe even glass shelving etc ie as you wish - but always keep an eye on dimensions
Mount the new shelves with the equipment
Carefully slide the cabinet back into position around the new shelves etc
It looks the same from outside but this time around the equipment is referenced to the wall not the cabinet
- and you may even then have done a new matching “over shelf” to isolate the turntable which by the look of it will be reading the heavy cabinet with a vengeance!
What my wife put up with…!!! (but this way you can even hide a Linn Sondek!)
…and we ended up with full fat Fraim eventually!!!
Best of luck - this is not one for those of a nervous disposition!
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@rogerwilco …
Hello 
…
I would definitely try these pictured below…
Stack Audio’s AUVA EQ’s
It’s completely risk-free,.as you get your money back within 30 days if it doesn’t work for you.
There are lots of very positive reviews about these AUVA EQs,.use Google.
Even though I have a Mana Acoustics Reference-rack,.it was better with these AUVA EQ’s.
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You already have the holes to move the shelf and add another, if the spacing is enough.
Try a bamboo board under the rega, a cutting board will do to try out and it can move to the kitchen if it doesn’t work out or you can order one cut to size, use three feet under it and try a few options, draw knobs from a DIY store are a cheap option.
Bucking the trend of all the suggestions…
- Can the maker modify it to have three evenly spaced shelves internally instead of two?
- I’d leave the rest alone. There are things like Quadraspire interfaces which can go under the feet and I use the Evo Q-plus ones. They work okay but I’d only use them if the hifi was in a totally non visible spot. Sticking anything under the feet just looks plain weird.
- You can buy semi-self tapping spiked feet for modifying existing furniture for hifi housing. They come with spike shoes. You drill the guide hole and then the spike socket taps in followed by the adjustable spike itself.
The best advice I have received on this subject was given to me by the late Richard Dunn of NVA.
Experiment, experiment, experiment. Don’t be afraid to try something unorthodox and don’t believe that because person X says “this works” that it will work for you. It’s your ears that matter; not anybody else’s.
My amps, dac and phono stage now live in a Ikea cabinet. I can’t hear any difference between this set-up and an expensive rack that I was previously using.
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The only definite here is that you don’t stack any components and that you must ensure adequate ventilation.
Other than that the effect of anything you do will be entirely unpredictable. It’s a case of ‘suck it and see’.
Don’t assume that emulating any aspects of Fraim, eg.glass shelves or cups and balls, will have a beneficial ‘Fraim like’ effect on performance. It could just as easily make it sound a whole lot worse.
This is without doubt the most sensible advice here. Follow it.
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That doesn’t sound sensible to me.
The OP has only just got the equipment and he describes it as sounding delicious.
He needs to enjoy the music for a couple of months, learn how the system sounds with the various genres he listens too, before he experiments with anything.
Of course he might enjoy experimenting. In which case he’ll have years of fun, rewiring his house with oversize cable, installing a fibre network, buying custom built power supplies with platinum plated fuses. 
The options are endless. 
From the OP:
I wouldn’t be happy leaving two expensive boxes stacked for any length of time either. It compromises ventilation and could potentially lead to long-term issues. I would want to address this ASAP. But that’s just me.