This car was originally a 7 wide model made by ScotNick, (as seen here) and was about half as long as the 48 studs long, 8 studs wide behemoth you see here. The Technic frame holds things together nicely, with the top plates being held on by pins with studs on the end.
This type of depressed center flatcar would normally hold turbine components or entire airplane bodies, but for my purposes it holds Lord Sam Sinister's car with barely any room to spare. Why, you may ask? I don't know, it just seemed like a good idea at the time.
NOTE: The automobile is inspired by this build which was in turn a modified version of set 70911, (Arctic Roller) This model is Sam Sinister's largest ride to date. Why it needs to ride on this flatcar is anyone's guess!
Sam Sinister's car fits, but only just barely. their is still a 1/2 stud overhang because of the fenders on either side.
As you can see, the 8 wide model dwarfs the 34 stud long official 6 stud wide Lego depressed center flatcar part by about 14 studs.
The freight car by itself without the automobile.
Two figures (sans tall hats) can fit side-by-side in the car, and their is space in the opening trunk for a briefcase. The model lacks the spring loaded shooters of the original 70911 set, and replaces them with the car's grille.
The LDD file for both flat car and automobile is here.
Comments, Questions, Complaints and Suggestions are always welcome!