[Alex V.]

Thanks for the input. It's not pretty, I agree; the welder said he was saving time and money by not tacking it solid, because what he put down was more than adequate - I'm not going to disagree, especially since he welded the inner side of the top channel to the inner roof of the van effectively boxing the perimeter of the roof. On the window clip he overlapped and just welded the edges down rather than butting the panels together and welding flush, but it's straight and workable so it is what it is.

I suspected seam sealer was superior to bondo in this application so I'm glad I asked. Any more input is welcome.