As pictured above, the double plug door version is available with either riveted or "waffle" sides.
A single door version is also available (rivet sides only) -
I'm not sure what specific prototype these models might be based on (if any). Based on the paint schemes used by Micro-Trains they can stand in for a wide variety of cars built by Berwick Forge & Fabricating, Greenville Steel Car, Penn Central (et al) in the 60s and 70s. The BFF class BX-187 car is equipped with fixed end bulkheads and shock control underframe and is assigned to auto parts service. The BFF Class XL extended height box cars are equipped with interior side rails and moveable bulkheads for hauling household appliances of high cubic capacity. The BFF Class B-100-5 Union Pacific cars are equipped with 22 Belt DF Loaders and have a 7373 cu ft capacity. The Penn Central X64 car is classified by the AAR as a "class XP" box car (specially equipped, designed, and/or structurally suitable for a specific commodity loading system).