Okay here's my commentary.
Disclaimer... I'm going to sound brutal. But if you were to buy this today, you'd be hoping the place where you got your stuff from accepts returns. You'd have to pay shipping back, and then try and figure out how to make the best of a bad situation. Lots of money down the tubes.
Intellijel 1U and Pulp Logic 1U are not compatible. You've mixed both in your 1U rack space. Have you picked out a case? You can go with Intellijel or Pulp Logic compatible. Your choices better fit that case.
As far as choices, you've covered your bases except for LFO, noise... AND A FILTER. You're going to want a multimode filter in here.
You have a mixer, but no attenuverters. CV modulation is important. You'll probably get your pitch and gate info from MIDI. The Steppy only generates gates. So it's not going to be a full on-board sequencer. Though it does have its uses.
All and all it's a very expensive first build for the limited features desired. You'd get more mileage out of something like a Behringer Neutron and then a small skiff adding functionality like reverb, ring modulation, sequencing, and any other toys you'd like (including other VCOs and filters, overdrive, etc.).