#ALinkToThePast on Kite's #CircuitSword CM3 & #BoxyPixel's shell (quite hefty) plus (IIRC) a PCB from Helder for the four back buttons.
There could also be a joystick on the front bottom left, but the case didn't have the hole for it and I didn't risk cutting (and likely cracking) it myself. It also needs another PCB IIRC.
The Circuit Sword didn't get much love for some years due to missing a proper shell and also needing a bit of soldering.
The whole GBZ concept is dead now.