Blocks great Idea. Thanks. What I did was to sand of the details on the fuel tank. and a little shaves off on the inside by the cab. Once I did that the shell sat flush with the frame. The RK don't have the side panel on the shell like the RC. So the RC side panel slip right over the fuel Tank. I still need to order some detail parts to finish and haven't decided to power it yet. Now if I come across one in the Blackbird scheme it will be powered. Picked up the whole RC engine (3R) for 80 bucks. The RC Chassis (Powered) is available If anyone wants it.