Hmmmm...well, echoing Jim here, take the Neutron OUT of the cab. It already has its own cab and power, so when you take something that has those and put it into another case with power, you'll need to factor in the price of the space/power you're now taking up in your main cab. Seems convenient to do, but in the end it's majorly wasteful of your Eurorack case space and power...especially at 80 hp. Remember: treat your more expensive Eurorack case space as a commodity...because, at the cost of Eurorack cabs AND the necessity for that space for UNhoused modules, that space should ONLY be for devices that require it. The Neutron doesn't.
There's some other things I could suggest, but with that one synth taking up 80 hp that it shouldn't, it's hard to determine what the ACTUAL layout of this (and additional modules) should be.