Al did you find the screw locations ? sometimes really tricky. I just did a Railking caboose that as Kadee pads, the screws where under the trucks and could only get to them by putting the driver between the wheel and the brake shoe, just enough room to get the driver in there but not the screw. MTH bodies are really overbuilt 
on a long car there might be more than four screws. And the roof might come off with the car ends be careful where you pry.
Clem
