Here's what the gap looked like.
So I made a pair of brackets for the front and ancored them at the strongest pulling points.
Then a pair of anchors for the rear, these went into the seat mount points. I first had these straight, but later changed them to angle up for clearance of the chains and to reduce the stress to the rather small M6 bolts.
I used chains to secure the rigging.
A 4x4 across the rear cab wall to distribute the forces and protect the metal from deformation.
Two come-a-longs were used at the same time, paying careful attention that they were applying even pressure. If they are not pulled together the center box structure can get distorted.
I pulled the frame past the correct angle and held the part in place. Using a large block of wood and a sledge hammer, I applied some pressure at some key points (around the air dam center column) to nudge the rest of the frame into place.
It worked out very well, giving a even gap at the leading edge and closing the gap at the latch. I will post the results when I mount the doors later.
Miles