I did this conversion my self. Its really pretty simple! Just be prepared for rust under the fiberglass plugs as they hold moisture.

Only 2 things you have to cut.

1. The post they weld in from the roof to the rear of the door frame; which its not a true post, just a support for the fiberglass plug.

2. A slot in the rear door frame for where the rear window rolls down.

Ill post some pics of before and after as I find them.