mounting body to frame

[Classiccanuck]

I have a 28 Phaeton, I'm now at the point of putting the body onto the frame, not sure of the process with shimming the body blocks to get everything lined up, I had started at the rear and had all doors opening and closing nicely, then the cowl had to be shimmed up to align the hood and that is when I found out I need to start at the cowl and work my way to the back, now the doors are out of wack. Is there any else I should know? or is there a publication on "how to"?