I need to use my HEROS enclosure, so I figure the Deck might be a good place to start if the spacing is workable.
The other option would be to buy direct from TG3.
What is a Heros enclosure? I tried googling and got a bunch of things from Kamen Rider to Heroes of Might and Magic.
As a Deck user, let me warn you that their spacebar is ridiculously rare. I have been holding off buying replacement spacebars precisely because it's such a pain and not worth it to buy from SP.
Actually you should consider asking TG3. Then at least you might get hold of totally brand new, 100% working Deck PCBs. Heck, if my Deck dies, I'll ask them. That might not be anytime within the next 10 years though.
Methinks the ideal is:
Deck PCB (the new type with standard layout similar to Ducky, Hassium or whatever)
Cherry clear switches
2x3x4 LEDs with SIP socket mod
aluminium casing similar to Ducky
cheapo ABS keycaps, Mionix or something - keep replacing them until Deck finally decides to get a tolerably nice looking font on its keycaps