Thanks for the case tips!
Arjan from 2 Many Synths is currently making some custom synth side panels for me. He also makes eurorack cases, so I'll see what options he has to offer as well.
I am quite accustomed to lugging stuff to gigs. I play drums and percussion in a classical orchestra and some pieces require TONS of stuff to play all the drum scores a composer has written. And you can't just have all that equipment on the floor during the performance as a certain kind of pomp and circumstance is usually required, so you'll haul all sorts of tables and drum stands to the concert hall as well.
Making electronic music is more for my personal enjoyment, but if it ever comes to performing modular synth gigs, I will get a specific case for that job and I can put the modules required for the performance there. So ideally I'd have two cases: one for a fixed setup at home and one that is designed for mobility and quick setup at gigs.