The most glaring (to me) inaccurate part of that R-40-20 model is the height of the door.? Among 40-ft PFE ice reefers, only the R-40-23, -24, and -25 classes had 4-ft doors that extended that close to the roof.? That's why I recommend building an R-40-20 model from an R-40-10 model, though the R-40-20 is an inch or two taller.
Less obvious is the welded underframe of an R-40-23 is not the same as the riveted underframe of an R-40-20, -14 or -10.