Thanks for the advice Garfield!
I'm looking to create an ambient/generative system (e.g. r beny/lightbath)
But, I've been doing more research and I think I'm getting a better idea of what I need to achieve that.

Here's the update!
https://cdn.modulargrid.net/img/racks/modulargrid_229447.jpg

It's still pretty full, but I'm saving a tiny bit of room and money this way :)
I figure I can always swap out future modules, too.