I tried posting on the original thread but nobody seems to be paying attention to it so I decided I’ll post here.
https://forum.qubes-os.org/t/qubes-os-installation-detached-encrypted-boot-and-header/6205/67
Basically, I’m trying the Detached Encrypted Boot and Header install with a special layout involving three storage drives - one for the OS drive and two as a RAID for the vm-pool.
Please read the rest on my post linked here.