One thing that comes to mind: with as many clock signals as this will have going on, you should look into some logic modules to create more intricate behavior with the gates you'll be using. On a similar note, a couple of comparators would also come in handy for similar reasons...you can use those to derive gate on/offs from CV levels coming out of the Stillson Hammer, for example. Maybe take the Switch Matrix out for some of that, potentially adding a much smaller thing like a Doepfer A-151 to swap sequencer CV outs to create longer sequences. Maybe toss out the uScale, also, since the Stillson has some potent onboard quantization. You can also recover another 4 hp in your top row by swapping the Maths out for a pair of Doepfer A-171-2 VC Slope Gens (basically they're akin to half a Maths each, minus a few extra jacks that you can work around). Even more space can be regained by swapping the Rings and Tides for Codex Modulex's 8 hp versions of each. See how much space you can get back by doing things like this; empty space eventually = more modules, after all! ;)