Hack it up! Go for it!

Wait.....What car are you going to hack up?

Depending on the car and glass configuration, you may be able to lay the windshield back at the top, and lay the rear window forward at the top to make up for the shortage of roof material. On a race car, Lexan will be fine for side glass.

If its going to have a cage, all the layers of sheet metal may not have to be welded, provided the roof & body are reinforced by the cage.

I suggest if you really want to do this, have several side, front, and back pictures of the car, and cut up the pictures. If you get something close have some Photoshop masters make a picture of your rendering to see if it still looks OK. Its easier to cut up pictures then it is to cut up metal, and you will have an idea what will need to be done.

I believe the glass and having a good finished appearance are the two biggest challenges in chopping a top, the rest is just metal work. If you can do metal work, the look and the glass will be the deciding factors. Gene