Hmmm...the ideas are there, things just need tuning-up. First of all, great sequencer...but where's the quantizing? Sure, the Chord has some quantizing capabilities, but after checking its docs, they relate to how it deals with harmonizing the incoming root values, not determining the actual incoming pitch CV for the root. So you'll still need something to quantize that root value in its own scalar context, THEN the Chord's quantizing-to-chords will have something to work with.
VCAs. Two really isn't enough. Yeah, I know they're not sexy and all, but several more are needed for both audio and CV processing. Maybe lose the Pico drum modules for those?
Can some of these modules be smaller? For example, the Modor Formant Filter and the Limaflo Motormouth are similar things (formant filters) but the Limaflo is 4 hp smaller and saves you about $150. Since you're doing a lot with Erica's Pico series, I don't think I need to go on much about jamming functionality into small spaces. There's not any way to sub out the biggest thing here (the Rainmaker) but I think a bit more digging around will turn up ways to regain some usable hp by switching in smaller variations on some of the chunkier devices in here. Also, I'm pretty sure that you can cram in a MIDI interface with more channels and/or functionality in the same 6 hp or less. So in all cases of everything, it might be an idea to go back and retune for space; even the Picos might be able to be supplanted in some way by larger modules that offer more of the same function in spaces not too larger than a few Picos take up.
This setup also brings up another point: if you're just starting out in modular configuration, always be prepared to make several initial sketches of the same basic idea, then distill those down into a case that's actually LARGER than what the configuration calls for. Blank panels are cheap, plus as you actually work with the physical device itself, you're going to be running into "I need it to do _______" situations, and at that point, you'll want empty space to jam more modules into. Even after some 40-ish years in electronic music, I'm always re-evaluating what happens in my layouts (which is what makes MG so useful!) and fine-tuning, especially because the Care and Feeding of a modular synth is spendy, and you need to make decisions you feel will work with the result feeling very 'instrumenty' from square one. It's definitely not a cheap commitment, so making mistakes and fine-tuning constantly (even down to trashing whole configurations in favor of something with better 'flow') is a MUST. Thankfully, we've got this resource!