Screen Shot 2019-03-25 at 2.42.10 PM Your CO2 bottom sketch of the car should show where the wheels will go. Do you need to cut into the car for them to fit, how far? Will the wheels be flush with the car?
Dragster Construction & Helps The following site can be used to help with CO2 cars and the attached file. https://www.instructables.com/id/Building-a-CO2-Race-Car/