[OLDKID]

Well , in your case , Holy Sanitary Job Batman ! That is strong with the fishmouth cuts ( hole saw ) , endwise tube , and boxed radius , ( I imagine you probably tig'd it too ) . In my previous post I was visualizing pictures I've seen in the past where somebody merely drilled all the way through , and welded shallow bung only on the outer side of tube , because it didn't protrude through to the other side , ( let alone the tube you added ) all bugered up with their crappy flux core welder . In this case I'd have to rule with the Heim's if done to your level of quality and engineering .