Thanks all-- I wasn't so much questioning welding as the method of attachment, but since the rulebook specifically states if has to be 'angle' I was more concerned that someone could get on my case about that later.
I have called and spoken to people before, including Kiwi Steve, and I'm not trying to in ANY way be critical-- I'm sure he gets a thousand phone calls and emails, and I know in my business, email is more efficient than spending time on the phone when it's possible to answer the question that way. Hence I was trying to minimize the amount of time my query took.
I can resend the email, it's entirely possible it didn't make it, or slid of the back of the desk, I know I have that happen sometimes here despite trying NOT to.
At this point I've got aluminum angle shrinker/streched to the contour of the roof, with seam sealer under it and flush rivets holding it in place. It's not going anywhere. I just had wanted to see if I could ditch the angle and just use a vertical strip welded to the roof. No biggie. If we get this answered though it could be useful for others.
I'll resend the email....
