"I was looking at the images of the Roundhouse 50' reefer series in the Walthers catalog. A visit to the MDC webpage proved useless. They provide little information and no images of these cars.
Item #'s of interest: 3609, 3610, 3611, 3618
Has anyone seen one of these cars in person?
Can you offer an opinion on their build quality? weighting? metal or plastic wheels? Kadee coupler compatability (easy change out?), paint and print work?"
The model is loosely based on a Lehigh Valley prototype car. It's an atypical design. The roof arch is too shallow to match other RRs cars. It can be replaced though. None of the paint schemes you mentioned match prototype cars.
As for build quality, it's a typical MDC car. Not a bad model. I have several. It will need to be weighted. Couplers can easily be changed as well as wheel sets.
The car can be kitbashed to resemble other prototypes. It's close to a Delawre & Hudson milk car, plans in the Feb. '86 Railroad Model Craftsman. You'd have to replace the fishbelly underframe with a truss rod/straight steel center, replace the grab irons with ladders and rework the door from an outward-swinging five foot to an inward-swinging (no visible hinges) four-footer. Also add a belt rail on the sides and ends and replace the roof with a steeper one.
Eric