I use two landscape timbers (6') buried vertical into the ground 2 ft deep, about 36" apart. Bolt on two 2x4's horizontally about 4" off the ground to the timbers. Nail/bolt a piece of plywood for a floor and lay on 32" x 10" (or whatever you want) pieces of carpet as high as you want. Mine is about 36". It'll take some carpet, but that can be found for free. Add two 2x4's horizontally for the upper support (with the back board about 3-4" lower. Add a plywood roof (the lower board will give it the angle. Be creative to hold the carpet down. You can use threadall and 2x4's and crank it down. I just installed two 2x4's horizontally (side-to-side) front and rear by lag bolts on one end (so they pivot), compress the carpet and hold the boards down with another board placed fwd to aft (about 10" long) and hold it down with a lag bolt. It works great. The hardest work is cutting the carpet. And best of all with some scrounging (legallly I'm talking here!) it can be made for $10 or less. It works great for broadheads when the carpet is not packed down so tight.