I tried to make one last year by stuffing about 500 plastic grocery bags into a 24" X 24" X 24" cardboard box. The arrows stick in there so tightly you can't get them out. Bought a Block 4X4 - I was somewhat disappointed given all the advertising hype that goes with this unit. Those endorsers must be well paid. Field points pull out of it pretty hard. My 14 year old son can't do it at all. I often have to put the target on the ground and place my foot on it to get the arrows out. Broadheads and particularly expandables come out pretty easy - but they bring stuff out with them that has created, in only about 30 shots, a tennis ball size hole in the target. I still have a 20 year old Morrell Eternity that is so shot out the the arrows that hit the middle often bounce out of the target. Still works though. I think I would buy another one of the these before I would try to make one.