Another detail that no one will ever see. Laying out the electrical runs in the floor. Each circuit has its own run.
From bottom to top:
driver front marker
Axle brakes
Stop/Turn/Tail
120V AC circuit 1 (Air Conditioner)
120V AC circuit 2 (Extra Outlet for Misc use)
12V DC circuit 1 (Extra for whatever I may want to do)
12V DC circuit 2 (Fantastic Vent Fan)
At the very top of the picture on the left is the chase for the passenger front marker.