There was a vacform conversion set but I can't find it, must of gone out of production.
I could scratch build but I think this is out of my league.

Execuform and GMH provided a conversion set.
With the GMH set you got a 1/72 scaled drawings and photos plus templates for making wooden spars.
Several other modeling sites have tried to get the scaled drawings to scan so that their modeller can build a 1/144 scale. There were rumors of a 1/144 vacform kit but theses seem to have stayed on the drawing board.