I haven't done it yet, but take an old, cheap clay bird thrower. Modify the throwing arm with a deeper & wider "C" channel to accomodate your foam disk targets. Break off the thrower's dirt spikes and bolt the thrower verically on some type of open-topped, wooden box. Make the lower bolt hole adjustable for angle of throw. Add a longer "PULL!!!" rope. Add 2 garden-cart or small push mower wheels to the box. Use the box to store your foam targets. Add an old lawnmower handle bar. Roll everything to the site and have fun with a red-neck aerial thrower. :D