Dave,
It is conceivable that the venders are holding off buying new stock to make sure they get the new and improved versions.�
I don't have anything to offer on whether the original sheet metal will work with new tubs, but I do believe that MD Juan is trying there best to solve past fitment issues.� The modifications that people are making is to the fenders, not the tub, so I would imagine your original fenders would work well with a new tub.� I think the original windshield will work too.� In fact, I believe the repro windshields have had problems. Stick with your original.
It's too bad many have had to suffer through the marginal versions, but again, I have faith that MD Juan is heading in the right direction.
Good luck... and let us know what direction you end up taking.
Tim