hi Wyobolter...Firstly welcome.

Is the cab still on the chassis,and are the cab mounts still in good order?
It's generally regarded as a good idea to leave the cab on the chassis as it holds everything square and where it should be.
Effectively using the chassis as a 'jig'.
If it makes you feel better it wouldn't hurt to add some extra bracing in the door opening before you start 'surgery'.
Anything you do to help the integrity of the cab has got to be good! IMO.

Czechman... a fellow bolter has performed some pretty major surgery on his cab,he,if anyone would be able to give you some sound advice.
You could try sending him a PM. I'm sure he could put your mind at ease!

Hold tight as someone else will chime in with there 0.02c before long!

Good luck
Jock thumbs_up

Last edited by jockbolter50; 08/10/2009 10:39 PM. Reason: addition

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.