I don’t know what you experience level is but I can assure you it’s not for the faint at heart. The roofline does not need to be modified but the car body will be needed to be extended. That means a lot of cutting involved, adding styrene sheet, adding the rear doors, extending the interior to convert to a 4 door model. Basically a ton of modifications that can be very daunting and difficult for a beginner.
You‘ll probably need to get 2 of the same kit.