Nice job. I did something similar with my Subaru Crosstrek. Bought an inexpensive hitch mount bike rack, mounted a 4' piece of aluminum angle with led boat lights on each end. Like you, I ran a trailer wire from the lights to the front of the car. Plugs on each end allow me to plug n play and remove the light rack and the lights when not in use.
Where there's a will, there's a way.