The top stop is a rectangle cut from styrene strip, and the bottom is a triangle cut from styrene strip. Height, width and depth dimensions of the original cast-on detail were taken with calipers and Evergreen strip was chosen closest to the dimensions. The model is pushing 20 years old so I don't remember the strip dimensions today.
The body is from the 50' PS-1 PD box w/o roofwalk; the ends are from the 40' PS-1 SD box w/o roofwalk. The door and stirrups are from the modern 50' ribbed SD box. The wheels and cushioned underframe were updated in recent years.