In reply to remus:
> It's surprisingly tricky to make a board that hangs straight when you hang it up.
Thread your suspension cord through holes in the top rung/slot of your hangboard, not the ply above it. Then it should be reasonably balanced when you weight it.
Will try to provide pics. I have a perfectly functional board made of a piece of ply with two different sized moon campus rungs screwed on. Can be easily hung in a tree. Guess it cost under £30 all in.