It originated with the parts packs, and was then issued in a double kit made up of parts packs. It's not one of those kits where you shake the box and it assembles itself, that's for sure. Lots of fit, trim, and fit again. The parts pack double kits were like that too, those parts weren't 100% designed to work together and little was done to make the double kits any easier. You do get a lot of parts though: several sets of wheels, two pairs of front tires, two engines, and a multitude of chassis parts including two front axle/radius rod setups and a bunch of small parts. I do wish some of them had taken a trip through the plating chamber, though--
--Mark