Brilliant design, this...concept is very sound, you have a really clear idea of how this should work for your purposes. Pretty cool, pretty neat.
About the only things that nag at me are:
1) The Cwejman VCF. Spendy and large. You might want to do a bit more looking around to reduce the size and certainly the cost. There's a lot of interestingly fubar filter concepts and topologies out right now, so it's sort of a smorgasbrod, but yeah, this could be a bit better.
2) Putting the Mescaline in the rack with everything else. I kinda like this instrument as the unitized control-surface/generator/mangler it is in of itself, both in functional terms and looks. Plus, there's the possibility of more space to play with in the cab...and at the very least, you'll want to add some other Folktek stuff to tandem with the Mescaline as well as to augment it, plus go from Dupont pins to 3.5mms. My instinct would be to put the reassembled Mescaline to the right of the cab, then run your other Folktek stuff in the right end of the cab on rows 2 and 3 to get some easy patching and interchange between everything pin-patchable. That sort of exchange might also come in handy for adding one or two other pin-patchables, such as Bastl's Softpop or bitRanger.
Otherwise...yeah. This is damn solid.