I don't use the doors since their all stuck shut. They probably do help hold it together some. I haven't had a problem with it sagging though. Theirs not much weight to it anymore anyway. I wouldn't want to hit something with it, that probably would fold it in. In case your ever stranded with your car somewhere with no automatic transmission fluid, you can use motor oil. I wouldn't recomend it but it works. I've been using used motor oil in the trans in this thing for a while and it works pretty much like normal. Most dents in the car are from a fight with a 96 honda accord. Thats when I still had the top on. The accord is now scrapped and the chevy is still going. Originally I removed anything the car didn't need to move forward to save weight. Interior, a/c system, radio, rear seats, grill, lights,windshield wipers. Then I found it tough to move the car at night, so I bolted some fog lights from an old nissan pathfinder to the roof. Kind of made it tough to drive in wet/muddy conditions without the wipers...I knocked a hole through the trans pan going over a jump, so I had to take that off and weld it back up. Car misses on a cyl or two sometimes, oil seeps through the head and fills the plug holes.