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I built my own just because I had a bunch of scrap metal laying around, if you don't have the metal already it would be cheaper to buy one than to make your own
I made one from heavy 2x6's and 2x8's that I had laying around just for fun. I also had a bunch of large bolts laying around so most of the materials were free. If I didn't have free stuff just laying around it would be much cheaper to just buy one at Harbor Freight.