You really are out of the loop, cuz draw boards - or tillering boards - have been around for hundreds of years. Here's a video of a guy explaining how to use a tillering board. Of course, he's using it for making stickbows but it's the basically the same rig for compounds. You should be able to see enough on the video to figure out how to make your own, if you want.
http://www.youtube.com/watch?v=0FxSVwom4OY