My first thought was to cut the legs down to two inches and have it ride on the new legs. I ruled that out because if I ever wanted to convert it back to a full unit I would have to by new legs. That said, I just began looking for metal blocks at the height that I wanted. Granger or other industrial supply houses would work well. I ended up using metal 4-gang electrical boxes that I filled the other edges to smooth them and panted to match the unit. Seemed to work well and be cost effective. If I still had budget money left I was going to have a local shop just weld me some boxes out of stainless to match the bottom tray.