First of all I saw that I need to learn much more about the basics of synthesis to delve further into modular builds. So I will play around with the Mini2S and learn with its internal patch bay.
None the less I of course played a little with the setup I posted before and the very useful information of Lugia:
https://cdn.modulargrid.net/img/racks/modulargrid_783304.jpg?1542060111
For the case: A couple of days ago I stumbled over the 7U 208HP Intellijel case and thought this would be perfect. Possibly I will build with that one when I start, but for the beginning I decided to stick with the smaller 176 HP setup, to force myself to only include what I really need.
Since I had the most input about the VCOs, I first discarded the drums entirely. Actually I wanted to build something more on the drums side, but I think to go through a VCO pathway is better for the learning process. With the drums gone I also decided to discard the Minibrute in the setup entirely. I will have it at the time I start my first build, but I thought it is better to build a standalone thingy. With the Minibrute gone I need something for the input. And this was the first real problem. First I considered the Mutable Yarns because of the MIDI I/O and up to 4 CVs/Gates for the 4 voices. But in the demos I saw that changing the patterns on the fly gets a lot into menu delving. Next I took a look at the Rene2. It actually does what I want but it seems I need a clock input for it and of course this should be the Tempi. Together this takes a lot of space and is quite expensive. Next I thought about the Doepfer Dark Time Red. This of course is no Eurorack module but it does everything I want for an OK price with 2 CV and Gate outs + clock. In the end I included the Mutant Brain MIDI in in the setup. It has 4x CV for the Twin Waves and more than enough gate outs. I can play it with a MIDI keyboard or over the DAW. That's not perfect but perhaps someone of you has an idea. I am looking for something with min. 2 channels with 2x CV/Gate out, clock and best 16 steps with accessible (less menu stuff) pitch and gate control for each step.
Next I simpled down the build a little bid. I removed the RND, Dual Lag and Shifty. As core part the 2x2 Twin Waves and the Steiner-Parker VCF stay of course. I replaced the Doepfer 142-2 with the KOMA Dual VCA, because: Distortion and Mixing. With the 4x ADSR (s. later) I think I don't need the Doepfer AD/AR (?). The Twin Waves will now be mixed additionally with with the Levit8 (4>1 or 4>2 into KOMA>1) into the filter. I replaced one Doepfer 140-2 with an intellijel Dual ADSR because I like faders much more than knobs. This ADSR can be used for the voices while the 2 Dopfer ADSR can go to VCF cutoff/resonance and/or effects. Right now I consider 2x TipTop Z4000 for the 2nd Doepfer. In the end I also chose Batumi with Poti over Zadar: more control is better. Last I downgraded the 4x VCA to 2x uVCA and hope this will be enough (?).
For the effects I originally decided for Crush-Delay. Since it doesn't have stereo effects I discarded it for an Erica Pico DSP and the uBurst/Clouds. For the PanMix I was thinking about the Verbos Scan&Pan (better control) but decied for the PanMix in the end because of the more channels (2xPicoDSP,2xuBurst, 1-2x post VCF?). I thought about the HN TriTone for a moment, it could act as a post VCF EQ or an additional simple LP/HP filter (some voices over the Planet the others over TriTone into KOMA VCA +Distortion?). Still not sure about this one...
The price now is kinda affordable, also it would fit in an 6U 2x84HP DIY case for the beginning...