BACK DOOR MUSTANG!!!
The Pegasus will have a BiG Jet Engine on each side of the body, blocking the doors, so I'm going to put in a Rear Door in for Driver Access!
I drew 2 lines from the rear window back. Then I drew 2 more lines about 1/8th inch wider at the rear. I will cut on the outside lines...
I marked the underbody with the same shape as above except, its about 3/8th inches shorter...
I used a Zona Saw and cut out the rear deck.
Then I cut out the underbody section with a Zona Saw and X-Acto Knife.
Here is the Body/Underbody Test Fit...
It Fits!