I just finished this fun little keeb which I based off the Hummingbird, but I made it hot swappable, dropped the pinkies down more, made the thumbs more reachy, and spaced it for Chosfox CFX keycaps (tighter than standard Choc spacing).
It has a top plate and sound-dampening silicone gasket, as well as foam on the backside of the PCB.
This is beautiful. Exactly the layout that I've been wanting too - 23332 for the fingers and 2 thumbs. I think this is the ideal balance between too few and too many keys while remaining super comfy.