"Done" is a relative term to a phase in your project where you transition from the building stage to the forever keeping it capable of being driven/used stage.
It's a great milestone.
I fully understand about the wiring although in my case the extra wire is all under the dash and generally out of sight. I have had to try and trace some wires through the excess loops, etc. under the dash making me wish I had done a better job in that regard but then I move on and forget about it.