Acquired new "C" channel. Acquired pop rivets for belly skin installation.
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We were able to find "C" channel (a.k.a. "U" channel) that is an exact match to original. The channel is 1/16" thick, with 3/4" legs, and a 1-1/2" base. The original channel is in sad shape, and just not worth trying to salvage given the effort that would be required to make serviceable.
The end curved sections are extrusions and not worth trying to source. I will have to take a straight channel section and notch the base and one leg to form the corner curves. This may not make a lot of sense without pictures, so I'll be sure to document the process when I get around to installing the channel.
Pop rivets for installation of the belly skin...1/8" diameter and 3/16" diameter with large head.
That's all for today.