The only problem with making a 4dr sedan into a 2dr is good parts .If you have good doors,good quarter panels and everything else required you probably have a good 2dr to start with.Also,it is time consuming and a lot of work.And,you are working on two cars instead of one.There is a 64 Dodge about 15mi from me that was started 2yrs ago.So far,driver side is about 3/4th finished,passenger side still to be done.