Just remember: the P/S is upstream from literally EVERYTHING here, so if it has some sort of catastrophic failure that results in passing a voltage surge across your DC busses, your entire rig will be toast. This is one part of any build that I always insist that builders overspec; there's simply too much riding on having stable, clean and reliable DC to go with something questionable for your power supply.
Otherwise, Jim has a point: this is NOT a large build, and trying to cram large modules into it will inevitably result in taking up space that needs to be there for other modules. Also, you can chuck the mults...the build's too small for these, plus you don't have enough CV destinations to require a buffered mult, as those are for correcting voltage sag issues that can crop up when trying to control several modules on the same CV line.