I printed this at 0.6mm with a 0.8 nozzle in PETG, but your mileage may vary.
Please do electrical wiring on your own risk and don't burn down your boat.
I have used M5X6X7 knurled heat inserts from here: https://amzn.to/3voRAKV
Busbars: https://amzn.to/48rviqK
Fuse: https://amzn.to/48lEtJ9
The author marked this model as their own original creation.