Wood, wire, Quick Disconnects, maybe crimping pliers, the software for the WinIPAC and some way to load it, a drill for making button holes, maybe carriage bolts and nuts for the joysticks, a wrench to tighten them, maybe a pushbutton wrench . . .
OTOH, except for the wire and QD's, you could just lay them out on a table and play so the other stuff is optional.