This is for free so I didn't want to post it in the Surf Shop. I have acquired from some office demolition a fiberglass layup panel like you would do for fins. It measures 40 1/2" x 95" x 5/8" thick. I realize it may be a bit thick, but I think it's still workable. The layers are fiberglass mat and the finish resembles burlap. Hopefully the attachments will show. If you want it, it's yours. I have recently moved and no longer have extra space for building much of anything, but I'm working on it. PM me for further discussion.
Ride on,
Tom