I just rebuilt the A pillar on my '47. Inner panel, intermediate and outer panel. Painful lesson.
Photograph everything from every angle.
Then establish known points on parts that will not move- draw a line between two known holes, for example, and photograph that too.
Then make many measurements to parts that will move, ie parts you will bend or remove and replace.
if you can, make opposite measurements on the other side of the cab to establish how symmetrical your cab is. If the cab is symmetrical, you can use the opposite side as a model.
Make lots of diagrams of the measurements.
it will allow you to replace and position panels with some degree of conviction that they are in the right place.
I thought I had made enough measurements but I had not. I relied on the photos and the other side of the cab and I am sure it is all within .5mm (20 thou) and thats probably as good as it ever got. It looks fine on reassembly.
Any work around the doors- fit the door , hang it right, and align the parts to that- that way, your door gaps will be correct when you are done.
you need to remove panel parts, and support the cab, in such a way that it will change shape as little as possible during the operation. So mounting the cab on an accurate dolly is a good idea.Use solid wheels on the dolly, and have the wheels have marked positions on a garage floor for fitting parts. Garage floors may vary in level a lot, even if they look flat.
Good luck! It was difficult finicky work but apart from massive care, I think anyone can do it.
