It is just put a Raspberry PI in a C64 case. I wonder if it can be done with those Kickstarter C64C cases?
If Phase 5 would deliver the replacement keycaps from their crowdfunded campaign three years ago we'd be able to do these conversions without touching a real 64. I haven't given up hope -- the machinery and molds are being moved to a company that specializes in this kind of low-volume production.
Maybe with these we could finally build the Commodore 256 ;-)