Make Noise make really really good stuff, I think im going to have a separate skiff case filled purely with make noise utilities in the future (If main case does not fit).
You will definitely want a Maths, theres no reason not to have one in a modular system.

Making a case isn't too hard, all you have to do is make the side panels, a base plate panel (if needed), a back plate panel (if needed), Rails and a power supply.
For custom cases just buy everything from synthracks.com, they sell sets of rails secured in brackets so its really easy to line stuff up and drill holes etc.
https://synthracks.com/shop/eurorack-frame

Then for PSU just use either:
(1) TipTop Audio uZeus module with break out cable and a Power Brick. (You can use however many uZeus you need, can have one in each row of your case etc.)
(2) TipTop Audio Dual Access module and some TipTop Audio Studio Bus Boards and a Power Brick.

The second option delivers more power and allows for 6x Studio Bus boards to be connected to 1x TipTop Audio Dual Access module, the Studio Bus boards have 14 connectors compared to the breakout cables 10 connectors just another thing to consider.

You don't need to be super techy, you just need a clear idea of what you want to achieve in the end, theres no 2 ways about it you will be spending alot of money lol.
-- spaceV2

Yea I understand it's gonna cost a bit haha.
I read before aswell that the Dual Access is the better option in case you fill your rack with some energy-consuming modules, or in case you want to extend later.. I guess that's the better option?

I'm definitely getting Math and I think it makes sense to get Cloud..

I didn't really specify before what I wanted to achieve but basically what I love about the specific sound of modular synths is that somehow... the arpeggiated sounds and slow evolving melodies really sound very gooooood through other people's systems. I think it makes sense to get a good type of chorus/reverb/tape echo/delay, but then I'm not sure if I want that from within the modular system or as separate pedals... Probably a combination of the two would be most interesting.

In any case I want to use the rack on the stage. So it must be possible to use it in a useful way, without having to patch for 20 minutes. I understand that part of it will be mastering the synth and trying to remember some patch routes that work, but basically I would be running arpeggiators or sequences from my beatstep pro (BSP) and then use the modular rack as a lead synth or some sort of atmospheric pad thing if I add more reverb and sustain.

I'm sure you all know Colin Benders: he's on top of his game.....!
But yea something like these sounds (at 49min)
would be what I'm looking to get from my system in the endgame situation. Obviously it won't start like that, and I'm not looking to make the bass, pad and lead all from the modular setup, but this arp sound .. it just sounds so right!!

Cheers,
Precursor