User blog comment:SociallyAwkwardEpic/Asked and Answered: Rockstar Editor for Consoles, The Lab for Consoles, Mods and More!/@comment-11885467-20150507175656/@comment-25295528-20150507185650

It's based on a Mercedes 300SL, which has gullwing doors (so, hopefully, and according to Wildbrick, it has gullwing doors in the game too).