Built this quite a while back, but still riding it. Baltic Birch. About 1/8″ of concave, and a small amount of camber. I added a kicktail out of solid pieces and sanded it all smooth. Added a ghetto-rigged skid-plate as the tail ...

Plenty of colours and use of a level to get this set-up well.  No water needed, as the wall was freshly painted.

A side-hobby surfing, has brought me towards trying to make my own board.  Here is a rough shape for a board I’d like to use for river surfing.