Well, you have two sequencers. Were it me, I'd get rid of the Metropolis and buy a 1010 Music BitBox. That will give you your drums... up to 16 samples of playback and any loops you might want. The BitBox has four outputs. So you can have a stereo mix, four individual outs, two stereo outs, or whatever you like (such as kick on 1, snare on 2, everything else on 3-4).
The BitBox will also sync to your master clock. So you could sample a loop... like a kick from the Basimilus and then reuse that module for something else.
Also, I only see one VCA. That's going to bite you. It's a combo ADSR and VCA, so that's really going to bite you.
I'd want at least two dedicated ADSRs (like an Intellijel dual ADSR), an LFO module (like a Batumi with Poti expander), as well as at least one Befaco attenuverter, and one 3-4 channel sub-mixer that's DC compatible. If you pull the Metropolis, I'm not sure that you'd have enough space for all of that. Perhaps a smaller main mixer?