Any rust on the car, under the t-tops, under the doors, etc...?
How many miles on the car?
If I were you and you have spent a lot of cash on the car you will not get back. The best way to proceed would be call Brian at gbodyparts.com He is in NC he has everything to make your car a hardtop. I have seen him do this several times with perfect results. Buy the time you swap titles, pay taxes, shipping and so on you could just have swapped roofs on your car. Just something to think on ...worth the call