Jon, to answer your question in the other post you have you can use hardtop floor pans. They are the same as conv. There is alot more floor bracing on a conv but the floor themselves are the same. Now to answer this one. A friend and myself are in the middle of doing a huge job on a 69 Buick Electra conv. He bought a Arizona frame that he wanted installed but it can't even be done that easily because the floors were gone, as in pretty much missing. The car was so bad that most of the frame came off with just a hammer and pulling on it. When you opened the door the windshield frame would actually drop a bit. If you shut the door gently it would not even come close to lining up with the quarter. You either had to slam it or pick up on the rear wheelwell. Yes the rear wheelwell to pick up the quarter. He is a eccentric old man in his seventies that has owned these 69 Electra conv since they came out and to him they are the best cars ever made. To him. Anyway there is no doubt you will never ever see a car as bad as this one. The floors were so bad that we had to get a parts car and literaly sperate the bottom half from the top and weld in the bottom half of the parts car into the "good" car. From inner rocker to iner rocker and from firewall to the rear of the back seat, all one piece. We had to take all kinds of measurements, line up the doors to the rear quarters and rockers (they don't really move so they have to be straight) and of course we had to gut the interior. With the interior guttted we welded angle iron from the kick panel area to the rear panel area on each side. Also welded a couple cross braces as extra support as this is a huge car. In our case when we did the floors the only thing holding the front half of the car to the back was the angle iron and outer rockers. This is a little extreme but the key parts are you have to make sure the car is straight before you start welding in new peices to make it more sturdy. You pretty much have to build a jig to hold the car straight while its torn apart. If its sagging and moving while its together just inagine when you start cutting.