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Light, some 1/2 or 3/4 inch split loom would tidy up those wires nicely and give some protection.

Good deal. It is however made of aluminum and now that its outside the door its exposed more to the weather, A coat of clear enamel might help preserve the surface. The writing is small and the detail is fine. It couldn't hurt to coat it. I've used clear enamel on aluminum antennas and it helped...

Nice job!! Have you thought of coating the schematic with something that might protect it from fading/weathering? Something with UV resistance?

Sure you can. Probably easier and cheaper to break the low voltage/low current DC charger output connection than house power.