Wiring kits?
Well, J par, not everybody is as good with auto electrics as you and I and a few others. About 40 years ago, I did a frame off restoration on a 65 Corvette that had had a fire under the hood. I made my own wire harness with about $20 worth of connectors and about $20 worth of wire. Like you said, It isn't a problem. However I think very few would try it. Wiring scares most people. Funny thing is that if they knew how easy it was, they would not be afraid at all. Each item simply requires current, a ground and some type of a switch. Piece of cake or should I say spaghetti. LOL