Skin out a seal ( old dead monk seals work well ). You want to skin it out so you have a big sock. Pull the skin over your board and let it sit in the sun for a day so it shrinks around your board. If you want to be creative you can leave the flipers 0n and adjust them to a good locatation on the board when the skin shrinks you will have an extra set of fins (ah flipers). Could do the same with a shark skin or dead dog or what ever.