There's actually only one change I think I can suggest here: swap out the Pico Atten for a Pico A Mixer to submix your VCOs before sending them onto the filters. Losing a couple of attenuators is a decent tradeoff for being able to mix your oscillators and beef up your sound with detuning, etc. Plus, I couldn't find a similar set of attenuverters for that 3 hp space; those would've been preferable to the mixer, honestly, because you'd also get the ability to invert modulation signals in addition to rescaling their levels...and inverse mod signals can be quite useful, especially inverted envelopes.
The other irksome part here is the presence of the power supply module right next to an audio module. Normally, that's something of a no-no due to the potential of noise creeping into the audio chain due to close proximity to a noisy element of the system. You'd actually want that next to something that's a modulation generator, utility (non-audio) module, etc, but right now it looks like there's no recourse for this.