Actually, the Mutable Instruments modules are open source projects. Yes, that also means that Mutable doesn't get paid from the clones...but it DOES mean that when Mutable takes them out of production, there's still ways to acquire that same circuitry, even if the panels and form factor might be different.
The only "hole" I see here is that there's no dedicated method for manipulating CV and modulation signals...mixing, inverting, etc. But the rest of the choices are very solid...which means there's going to be a problem in trying to jam that functionality in. My choice for what should go would be the Chronoblob2, which would open 12 hp. This would make two very good CV manipulators possible: the 4ms SISM and Tiptop's MISO. Both of these allow DC-coupled mixing, but also inversion, various CV arithmetic functions, etc, and having those will really blow open your control possibilities. Plus, if you still insist on having the delay line in there, the MISO would allow for a 2hp Delay; if you locate this on the very end of a row, it'll still be easy enough to manipulate.
But if tandemmed with the 0-Coast, this is a pretty damn good build. Presumably, you'd sum your audio back down to the 0-Coast's output to get the levels down to line. Looks like you did your homework here!