To the OP-yes, I believe they should be in box stock. Now if they did like a factory category, then that's a different story. Now, say you take the Revell '69 Nova (the 2 n 1). You build the drag car, exactly the way the instructions say. There's no real customization done by the builder. But if you put a bigger cowl hood on, made a roll cage, made all the goodies, then it should definitely be in a different section.