Very exciting! Happenstance yesterday renewed my interest in DIYing a CM4-based laptop motherboard replacement, and having more open designs to learn from will only help that. I'm looking at qty=1 so expensive components aren't such an impediment...
I wish more designs would go open when they're no longer commercially viable. All it's going to do in the long term is breed better hardware designers, after all.
P.S. I'm a Wiretrustee author