Looks good. Smaller than my benchtop unit. Mine is only for 2 ton. I like what you did up top... but I think your crossbars are a little light on the bottom. And not being joined together may cause them to bow out.... I don't understand you used heavy construction on the top.. C channel, what appears to be 3/8 plate, double grade 8 on the c channel... and then a light crossbar... ??????????????