Very rapid developmental pace so far! I can barely keep up, and all I have to do is read!! . This is most exciting, really pumped to see this coming together.
Speaking personally, the Dark Tower build is by far what captivates my interest the most, but the low vertical profile of the aio build is also tantalizing. Although, again only for me, aio's are a no-go due to the intent to use as a traveling PC. Some have taken their chances and gotten PC's with aio's past airport security, but I'm not sure I'm willing to take that risk.
Either way, keep up the fantastic work!
As I'm limited on time and resource I'm mostly trying to perfect the main enclosure that's 13" (330mm tall - for the dark tower build) enclosure first, which could be used for the mini/short GPUs layout. Once perfected I can probably just shrink down 2-3 inches for those who want to use smaller GPU but that's not the main design point right now.
And realistically, going with hybrid/smaller gpu only shave off about 50mm in height but in the long run you're limited to only using smaller GPU. And the taller enclosure also give you more versatility if you take into consideration of the T-sandwich addon kit.