I am maybe being overcautious Mark, but wider gives those wings a little more stability I would think. I can't imagine a scenario where they would twist, but I would feel better having them a bit wider. Especially if I am the one suggesting the plan!
http://devestechnet.com/Images/Projects/Project1959235/Project59235343lg.jpghttp://devestechnet.com/Images/Projects/Project1959235/Project59235347lg.jpgIf its pictures of my welding job you are looking for, I haven't taken any closeups of the weld. I beveled the outside of the tube heavily so I could get lots of weld there, then ground it flat. The inside weld is single pass. I was going to do a double pass, but with a 220 mig on its max setting and the wire speed I used, it all came out really nice the first time.