At first, my plan was to 3D print the whole body of this thing. A lot of plastic, figuring out how to attach the sections without interior access, and a lot of printer hours. NOW I think I am going to 3D print the frame and grips only. These can be bolted together/to each other on the inside

The side panels can be cut from thin sheet metal, acrylic or thin plywood and screwed or twist-latched. This will make accessing the interior much easier for tweaking/repairing electronics etc.

The generator bits I haven't figured out yet. Maybe I will print the domey things so they can be screwed on to the frame.

The channel for the LEDs in the accelerator and barrel could be cut from acrylic sheets and bent with heat when necessary.

I think thats about it.