The original card sides were Scribed Swarthmore. A considerable improvement from these more or less card stock sides that were okay it their day, were subject to warping or humidity if not completely painted. The 3D Print gives options in terms of plastics available such as PLA or ABS with excellent accuracy. These sides are "as is" from the printer build plate. Of a modeler so chooses to detail the insides, a very thin layer of scribing can be supplied for an addition $4.95 laminated to the insides of the caboose.