Mat, this build seems pretty solid to me.
The 3 points I have questions about:
-- what will PNW be doing in this setup? It's a great module, but I don't see obvious uses for it here
-- why Scan & Pan vs alternatives or other uses of that HP?
-- why the DUSG? Wogglebug + ER101 + Quadrax + QX already give you a lot of CV for this size a rig, I'm not sure DUSG adds a lot of value alongside your other CV, and it sure takes a lot of HP. If this was my setup, I'd be tempted to put Joranalog Morph 4 where DUSG is. Morph4 is totally different than DUSG, but you could do interesting things in this setup with Morph 4 such as pull several outs from DPO and morph them (at LFO, sequenced or audio rate!) or use it to morph CV that's fed to something else.
That's just what I think when looking at this setup and how I normally work. If those modules are good picks for you, no problem.
Last, I should mention I consider 4MS SISM or Tiptop MISO important in any mid to large setup.
BTW re trying to emulate a Buchla setup, I watched the Tiptop / Buchla announcements today and it sounds like modules will be released here and there over the next 12 months. Between release dates and getting a module (they're likely to be popular!) it could take a while to get one.
Cheers,
NG