Hi Garymon,
I'm also doing the "groove box" thing, but with some non-modular assistance. You can do a lot with not very much. 6u should be enough for anyone, eh? For example if you listen to the first minute of :
https://the-erc.bandcamp.com/track/2020-06-28
Except the hihats, every sound is BIA, with a bunch of modulation, and some outboard delay. The sequencer and modulation source is Pam's New Workout. This is my rack, though at the time I didn't have Font. (The bass that comes in after 30s is a DFAM.)
I have basically decided that what I need to take this setup forward is a Beatstep Pro to make it more playable. It can do more than most Euro sequencers in the x0x style at a much lower price, and the buttons are nice and big :) Pam can do Euclidean rhythms and random pitch/mod sequences when those are needed.
Anyway, coming back to your rack, it looks super fun. The only thing that looks off is you've only got one "normal" oscillator for the Percall to chew on; I feel like you want another to justify its hp. By count you have 22 potential trigger/gate sources, before you start making more out of kinks, which is plenty :) A switchable OR bus is very useful thing to combine rhythmic sequences
p.s. Sorry for hijacking your thread to rant about mixers. I think I meant to post in a different thread :-/
Latest stuff : https://soundcloud.com/user-352590333