So that slides/inserts could be easily swapped to create a new product and spread the development cost over more SKUs.
The dadgum this really is a neat little car, and with some creativity can be any of a zillion or so hot rods, Stock- and Super Stock class killers, street machines, mainstreamers...
IIRC, someone on the board had already bashed the Demon with the 'new tool' 90's Duster with pretty good inital results.