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The Budget DIY Electric Longboard
You can try using a plastic case of some sort and drill holes in the side for the wires. You can even make a wooden one, just as long as the electronics are protected. You can try using some sort of glue, but welding works best. Also you might want to use a different motormount if you're going to do it on penny board trucks, so I would recommend switching to paris trucks. Good luck!
Try an sk3
Would you be willing to ship them?