I’m intrigued by that Hitbox controller, never seen something like that before. It must be the ultimate controller for VIM users.
If I want to build my own what kind of PCB-board should I use? I read that early versions of the Hitbox blocked both sides when back and forward are pressed simultaneously giving it an unfair advantage against cross-ups. Newer versions seem to result in neutral when forward and back are pressed at the same time.