Tyle, yes I made one years ago, from a scrap piece of wood and some paneling nails. Nothing fancy, but usable! I got the instructions from an old Archery mag.
Check out the how-to section, there is one on there. Really you can use two nails in a 2x4 at a certain distance, and then stagger the strands about a 1/4", for the taper.
I add 12" to the actual bow length, you can start at about 16" and go from there!
If you have more ?'s, feel free to pm me.