Thanks guys. That’s Floquil Reefer Orange…which doesn’t cover worth squat. As far as the prototype goes, there were many different types. I haven’t found any that were narrow gauge. 
(http://jbrr.com/Pics/RollingStock/Boxcars/Ventilated/Prototypes/936_1945.jpg)
(http://jbrr.com/Pics/RollingStock/Boxcars/Ventilated/Prototypes/saap8499web.jpg)
(http://jbrr.com/Pics/RollingStock/Boxcars/Ventilated/Prototypes/cg7950asw.jpg)
I would suspect that vents could be covered up - or closed depending on the type of vent. It would certainly be easy enough to have a board cover the openings. That’s what they do on the J&B.