Encryption support would be awesome. I was planning on attempting that after I got the basic multi-disk support working (same with sub volumes)
Totally up to working together. I've been kind of stuck due to the systems bug that doesn't handle dependent drives very well for multi-disk FS. That is causing my VM tests to fail. I did a proof of concept on actual hardware, but it requires a external systemd mount to be created after the system has fully booted so it finds the drives. Not ideal for being declarative. Curious for input or ideas!