This download includes the .STL files for the parts needed to convert your Budd RDC into the M-497. This includes the streamlined front end and the roof-mounted jet engines. Both of these parts will look best from a small resin printer (Anycubic Photon, Elegoo Mars, etc.), but you can also use an FDM printer. You will also need to fabricate the skirting on the sides of the car.