9" Tall 8" Wide I Stock 3/16" in 6" Wide.....The width on the upright bracket could only be 6" Wide with some fancy gusset fabin at the bottom and be plenty strong.
Tim, I' not a welder/fabricator by trade, but I stayed at a Holiday Inn Express last night...
How about welding two pieces of four inch stock together & grinding smooth, to make an eight inch wide piece? Or would that be prone to warp?