The second way would be fix the rockers on the vert now tie together the 4 door replace one rocker at a time with the vert ones cut the roof off graft the front window frame on and the rear pieces too make it a two door vert. Either way the cars made up of the same pieces just make sure both cars are in your name keep a good picture record if you ever sell it make you show how it was put togethered. I'll go with the second seems easier.