Because this 69 Mach 1 Mustang is being built by bringing the 69 Mach 1 and a 89 Lincoln Mark VII together, you can imagine that there was places were the two did not match up as one would like. This meant that there were gaps and spaces that needed to be filled. So, before we go on we'll give you a look at those places.
The first area was where the 69 Mustang firewall joined up with the engine compartment of the 89 Mark VII. On both sides Allan bent and shaped heavy gauge metal to not only fill the gaps, but also reinforce it behind or under the front fenders and inside the engine compartment.
The 69 Mustang was then rotated on the body stand so it was easier to work under the Mustang at the back where sections had to be filled in. Body metal was used to finish of behind the body panels and fill in the empty places in the trunk floor.
The last picture show one of the trunk lid hinge brackets installed back in place. These were not there when Allan bought the car. And of course, they would have had to been reinstalled anyway since the floor is now that of the Lincoln Mark VII.