This was asked over on another board today. Its probably going to wind up costing a arm and a leg probably for the liability of a a body shop cutting apart your roof. But I'm sure any "decent" body shop would be able to do it.
If you read the guide, it doesn't seem all that bad with the fact that the framework is all there.
http://members.fortunecity.com/gripe...onversion.html
Are you going to get the parts yourself?