I do auto electronics for a living and as a rule we only put what we have to along the frame and outside of the body.
Clam wrap is used almost all of the time, but there those "taped connections" that finish off a design ( not one of mine ).
I ran about the same wiring.
The PVC pipe is interesting, what do you do with condensation? I would also be worried if I had to work on it later and had to find a wire in the pipe. Reminds me of a few Corvettes I worked on that had fuel lines in the frame. When the lines deteriorated and leaked, you could not service them.
Good luck with your wiring.
