Thanks everyone -- these are great suggestions. I guess it stands to reason that the metal would be the most brittle at the weld-points, but like Damon, past experience suggested that I could get away with making those bends.
I'm going to go ahead and try Raybo's suggestion. This will allow me to add clip to the 'slightly irregular' cages I've already made, and I can use the clips to make extensions, an idea I've been toying with (after last year's Opalka grew out of the 5' cage, all the way back down to the ground, and then crawled along the ground for an extra couple of feet).
Thanks again!
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