overview | wobble boards / balance disks | pipes | slant board
The slant board can be created from a couple of hinges, some wood screws, a length of 3/4" plywood, and the appropriate power tools. [Note: the detailed pictures of this construction are not posted yet — stay tuned for updates.]
I started with a 3' x 1' section of 3/4" plywood. I cut a 1" strip off of the end, then I cut the remainder in half, resulting in two pieces of equal length (around 1' 6" each).