Just dropped it off the the BIL. As it turns out he does not have a TIG setup like I thought. It's all good though he's got a flux core that he says he can do it with. He's been building cranes for 20 years welding every thickness of steel imaginable so if he says he can do it then I believe him.
He's gonna cut out a piece of 1/8" plate the size of the hole and weld it in. Then I just have to cut in the new vent holes and make some aluminum daisy wheels and I'm in bidness!