So Home depot has a fiberglass pack which includes the exact amount of cloth to do a 3 layer seat pan. I've never messed with fiberglass.. interesting. Why when you see parts to buy they are a blue color but this stuff is an amber/resin tint.
Also, now that my wife has started hanging around the garage she has expressed interest in maybe riding with me now and again.... which has now made me realize I will be making two seats ( single, and a double) with an easy swap system. So there will be no electrical in the seat to make that work.