I don't know the present condition of the moulds, but they lasted long enough after the sidewinder version to be used for the Bachmann Plus version. The latter had a can motor and a large flywheel/worm gear. Not quite up to Spectrum standards, the were, never the less, miles ahead of the sidewinders in terms of smooth operation. If Bill has super detailled the shell of his sidewinder, a Bachmann Plus Consolidation may be the way to go. Very little modification of the old shell is required, and it is all on the inside where it does not show.