I've only built the 71. The hood was very warped. The cab roof was a bird bath. I tried hot water, but couldn't get it out. In a last ditch effort, I turned a stove top burner on high and held the hood over the heat. I was able to get the warp out of the hood, and remove the dish from the top of the cab with no other damage. If you try this, be careful, the plastic will get soft quickly.