DAVEJR0,
It was a battle to get that roof to lay properly, I had to so gradually press down on a small area all the length of the car at a time, while holding up the opposite side and roof from dropping and sticking too soon.
I'm not eager to start any more of these. I'm relieved they came out as well as they did. I need to post pictures of the problem areas though. Mostly the seam where I had to cut the roof from the one side to salvage the project. Terrible feeling in the gut when you think you may have to throw out a few hundred dollars of passenger cars and styrene.
I think if you could find a donor car with the right roof, you could use just the car sides from USP and the project would be much easier. USP sells just sides. If I do any more I would rather compromise on the roof style and just do the sides, than fight with the wrap again. The Lionel UP cars I used had a roof rail that needed removed which left holes where the roof rail had taps holding it to the roof.
