I dont know where you would get the curved heavy bearing wheels because I bought mine as is from shershah.
Its a little tricky and works your whole body - because you have to control the pressure pedals with your feet while your leather covered hands push and pull the sheet metal removing creases.. When I had the ponton thing made the guy handed me over a rather dimpled incomplete piece - and when I took it back he could not believe his eyes what had happened - It was smooth - he then carefully hammered/lined up the front, rear ends and middle swage line and fit it on the car - for kicks I stamped the chassis number on its inner skirt too. (H)
It took me half a year to self learn how to work it, because many times I would end up with a straight sheet of metal again.
Given enough dedication and time you can hand craft body panels for your bug. I find it quite sad to see our crafty welders and denters heat the metal so much, it literally warps it.
btw doc, wheres your raggie