Here he is standing next to a 15'-4" board that is 30-7/8" wide and weighs 40 lbs. It's styrofoam with epoxy resin. (I saw some spectacular Hawaiian tandem surfing on TV last night.)
I told Andrew about my trouble riding an air mat and he said the really good mats were made by Dale Solomon and called Pneumatic Surfcraft, no longer available. They had, among other things a very roughened up top deck. He gave me a lot of mat riding tips, so I'm gonna give it another try when I get home.
Boy, was it fun to run into a brother native son, and a surfer to boot.