that's funny... I'm on the look out to sell some of my old GBZ modding stuff... I have a random box full of GBZ bits and pieces... haven't had time to go through it all in detail, but I can see that there's:
- at least two DMG cases (one has been dremel modded to take 4 buttons a bigger screen)
- a hoolyhoo GBZ back button board v1.1
- 2 batteries
- a Kite Super AIO board with Pi Zero pre-soldered to the board (done by Kite himself) - v0.5e1 PCB
- a bunch of other random GBZ modding stuff
I think there's everything you need to make a GBZ... are you interested? whereabouts are you based? make me an offer!