The more I look at these amazing designs, the more I like them. If two options are available, my choices would be:
1) Plain and simple like the OTD365/Kmac
2) Hammer edition
-Both with changeable tops (60%, HHKB, Winkeyless)
-Optional Diffusor (No changes to the design, this would just be 100% optional).
If you're able to get brass plates, they would be some pretty amazing stuff.
Brass, carbon, aluminum, steel plates. The works!
Can't wait to see what else you come up with, Snev!