Again, I renew my objections to trying to do this with modules from only one manufacturer. That might've been the routine back in the 1960s and 70s, but back then you didn't have the current plethora of module choices. And part of why I'm objecting is actually right here in this case: the Quad VCA.
OK, so that module is based on the original Veils VCA topology, and it's 12 hp...like the original Veils. But at this point, Mutable's moved on to a v.2 of that, which fits in 10 hp. And anywhere you can save space means that you have more space for functions. And with just one VCO, you need more functionality in that one point at least, since you have no way to detune between 2-3 VCOs to generate a bigger/fatter sound.
Another problem with this plan is that you're forcing yourself to use modules that, in this build size, are on the edge of taking up too much space, and the Rainmaker and Metropolix are definitely too big for this case size. In fact, those two modules alone take up 70 hp on their own...and you only have 208 hp of 3U slots, meaning that nearly 30% of the cab's main rows are covered by just two modules. That's not a good way to proceed.