We've taken our standard sailboard, chopped it in half, thrown some hinges at it and wallah - we have our folding sailboard! These are brilliant if you are tight for transportation space and storage.
 
Check out our customer photo - you can barely see the dividing line!
 
Made from 12mm MDF, with standard feet. You can see from the photo when it's folded, it comes with two 'pockets' which a rectangular piece of MDF will slot into which will support the top half of the board.