what i meant by rag top was a rag top sunroof type deal where it extends pass a normal size sunroof actually goes from the front to the back of the car. you roll it back and you have a super sunroof, ragtop. that's whatDo you mean the head lining or do you wish to make it a convertible?
The head lining can be easily bought from most motor factors but fitting it is another story.
Coach builders such as Crawford did the convertibles back in the 80s but it's probably something you can't easily do yourself. The Crawfords used the coupes which already had strengthened floors and pillerless doors etc. but still had to do more structural work to compensate for the loss of metal to the roof.