I got another wild hair and decided to try and build a board using Dow Blue and Ownes Corning pink. I hear from folks all the time that want to build a board, but don't want to use fiberglass or epoxy/polyester. I was thinking that a softop could be made from material acquired "mostly" from home depot, without special tools or equipment.
I also think this board can be made for less than $50 EXCLUDING fins. The fins and boxes alone can run this much.
The top will be EVA foam. It's commonly available in things like yoga mats. I think that I can get a sheet big enough, for around $10. The bottom will he a slick of PVC and I can find a 1/8" piece for around $8. The XPS foam is around $20 so that still leaves $10 for Gorilla Glue to affix everything.
The concept, so far: