Hmmm...the solution to the case issue is actually right in front of you if you still have that 2S: an Arturia Rackbrute 6U. It fits above the 2S via its special bracket/handle setup, and it'll deal with this present build's issue of a too-small cab. I would suggest implementing that with less audio modules and more modules that can throw the 2S into sonic conniption fits: modulation, clock tampering, logic, etc.