For what you are planning, the lack of filters, VCAs, VCFs, attenuators and attenuverters, you are just going to have a very expensive and poorly functioning sampler on your desk.

You've fallen into the same pit as most people new to Eurorack fall into. You seem to not understand HOW a control voltage environment works and you're cherry picking modules that you seem to like. You really need to educate yourself how Eurorack/modular synthesis works and start planning AFTER.

I realize that you're planning for this to work with VCV Rack. But there are gaping holes here. I'm not picking on you. I hope everything works out well and you get everything out of your gear you're looking for. But this build is just lacking.