Where ?
Rex wasn't the only frame man around of course, I've probably seen half a dozen frames of various types converted/changed to something else in the past decade or 2,
just from visiting folks garages. A bundle of tubes back into a serviceable frame before your very eyes !
And, someone local here who was trained on frame repairs by HD has a thriving frame and fork repair business, he can tackle just about anything.
The local club gave him a large HD multipurpose frame jig that was kicking around, since he could actually utilize it, amazing what a few tons force can pull back into line, for starters.
The trick of course is knowing what has been repaired/altered correctly, and what has been bodged up to look like it... !!!