Made one using carpet,a tight weave is best like Berber not shag, my size is 36" long x 11-1/2"wide carpet, compress between 2-2x12 with pipe clamps to the height you want mine was 36" and when I tightend the pipe clamps it came out to be around 32" then just screw in 2x4 to both sides of 2x12 to hold together and remove pipe clamps. I used treated lumber,its been in the backyard for 4 yrs exposed to weather and I have'nt turned it around yet,a little work but looks to last at least another 4 yrs.The carpet's from a tear out and recarpet job free for the taking,it was already cut at around 24" wide in long rolls. Check with a carpet guy you might even get paid to help take it out,so besides the labor I put into the target I saved hundreds in buying targets so far.