one of the guys at our gym(my lifting partner) works at a cabinet shop and has made lots of boxes/rings/parallets(sp?)/sleds for our gym, as well as for members. He's got the perfect setup because he makes them out of waste from the cabinet making, but it's very high quality materials so they equipment is awesome. Plus, on the boxes he rounds and smooths all the edges. they are better built and better looking than just about anything you could buy online. He's also made a few that have CFB(CrossFit Brevard) inscribed in the wood on the top.