Resin board is a a man made fiber board. Used in boat building. Steve Sanford would be the man to ask that question. Will it take stress, etc. Made a few shelves etc out of pieces I got in my travels. I used marine ply for mine as I had pieces.
Greg, nhow about a resin board glued up? I used marine ply on my southbay, glued up with West System. Try a large marine yard, they might cut it for you.
Go to a few shows meet with dealers, collectors and vendors. Collectors will travel to find a few birds. Local DU, Waterfowl USA will have members interested. Start small. Decoy auction house for apprasials.
I picked them up at a auction. They are Point Pleasant coastal blackduck and look like the never hit the water. Interested in the history, most have three letters [ RWG, EP ]. Gun club, two guys?