I agree with Dave. I have never done it ,but IMHO I like the lines that are in the station wagon roofs and van roofs. . If you get one you get the supports with it then can fab tabs to your car.
I think you can work your tail off with what someone else did and be very dissapointed. By changeing it you will start with a perfect roof and then only have to deal with tackin it in and can find lots of pics probly here and other sites that will help.t