I need to make a small stool, roughly 30" long by 11" wide and 15" high. It has to be portable, so I was thinking along the lines of some kind of folding legs. It'd be nice if the legs could lock up in the folded position and down in the > 90 degree position so that it's nice and stable. Anyone have any ideas for something like that? Most of the locking hinges I've seen are 90 degrees and they don't really lock that well. Maybe just a hinge for the foot and some sort of sliding thing to interfere with it's closing.