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Hi and welcome Majestic. I agree with everything Jim said. You will want more VCAs than just the Tallin, and you do have too many feature modules and not enough utilities. The Zadar and Batumi will offer great modulation possibilities, but you will want to attenuate/invert/control some of that modulation (a Happy Nerding 3xMIA and a quad VCA, maybe?). Jim's suggestion of starting with the Korg SQ1 is spot-on as well. You may find that you want to go a different route than the more expensive Vector Sequencer.
I prefer larger modules too, so I had to get a much bigger case to accommodate the utilities that make the fun modules more exciting. All of the feature modules you have chosen are great, but you won't get the most out of them the way you have planned this out in such a small footprint.
My final food-for-thought is to consider a different polyphonic source besides the Chainsaw. I had the Chainsaw along with the WMD Triad, and found it to be very limited for the cost. I ultimately decided on an external hardware polysynth. Just an idea to consider.
Have fun and good luck!