Nice...the only thing that immediately comes to mind here is that the buffered mults aren't necessary. There's not enough CV destinations to justify them, and in something this small you'll want to use stackcables or inline mults instead. However, what I would suggest as a substitute is, as far as reverb goes, the sort of thing that fits into a Buchla-esque rig that's got tiles: https://www.modulargrid.net/e/intellijel-multi-fx-1u It gives you a mono-in/stereo-out processor that does reverb, chorus, and delay. Chorus isn't so Buchla-y, but the other two...yeah.