P.S. I have looked at a number of pictures of this car and there are plainly seams between each end piece and the car body. And I now remember seeing one of these cars and it and other K-Line observation/end cars had chromed plastic end pieces inserted into the aluminum body, which these photos show clearly enough:
What I don't know is whether there is a long screw through the frame into the roof of the plastic assembly at the rear. I think that you had better look for that; it might be just visible in the last photo if you scale up the image around the rearmost side window.
