Couple points on your setup above:
• ! Don't forget you have existing utilities already built into the rack (Mults, MIDI in)
• You probably don't need that 2hp Mult when you have 3 x 4 = 12 mults above.
• You can free up 3U space by getting the MIDI 1U and linking it to your case's MIDI IN instead of uMIDI.
• Also see the Steppy 1U instead of the 3U.
• With the room you save you can get a Triplatt and Mixup, and scrap the Quadratt in the 1U
• You could also remove the Amp and get the Quad VCA.
• If you want to perform, why not get a Planar and remove the 1U crossfader.
Also consider shifting a few modules:
• Metropolix and Atlantis both have outputs at the TOP. They should be at the bottom of the rack. Otherwise you will have to draw your patches downward over the controls, obscuring them. And that Gx will probably need a custom cable to extend to the other 3U bar—but hey, it fits! Do what must be done.
Here's my sketch:
Things to consider.