Its been a long 6 months with no real activity on Stella. The marginal fit of the rear cab corner left me scratching my head as to a path forward. I finally jumped into it today and finish cut the panel to fit and tacked it in place along the match line. The only remaining mismatch is in the lower right where the new panel tacks to the cab along the original cut line. I have decided to massage that body line into place after i finish the weld line and all the plug welds. Worst case, i cut it, reshape and weld it up.
I previously sanded and primed the inner cab corner side that faces the outter cab corner since there was no way to accomplish this after the outter cab corner is installed. Sorry, no pictures of that work.