Looks like a fun rack to me!
Just to weigh in on the drum discussion. It's definitely cheaper to do percussion externally. I tried that and found I liked the modular approach better for my workflow. It cost a small fortune, and it's a lot more limited than an external or software approach, but I just didn't enjoy working that way. I kind of appreciate the limitations to keep me creative.
The Moffenzeef Mito (sadly discontinued) is an amazing hands-on sequencing tool that I am using with the Buck Modular DrumF*ck (criminally overlooked glitchy drum module, but sadly no individual outputs per drum), Basimilus Iteritas Alter, and Endorphin.es Blck_Noir (for CR78 style post-punk and synthpop sounds). I may pick up a Bastl Noise Square and Skis to dedicate to even more percussion sounds. There are cons to this approach for sure, like Lugia mentioned, but we all find what works for us as individuals. I'm finding that drums are probably my favorite parts of my rack.
Let us know how your new investment works out.