Good to know about the windshield opening. Hopefully I will be able to leave the bottom of the visor-like overhang in place, and hopefully that will help preserve the dimensions. I haven't looked into it yet but does anyone know where I might find out what the factory tolerances are? I guess I could always just measure the opening as it is now and just make sure it stays the same, but it would be nice to have a range. I might be able to weld in a couple of braces to help maintain the opening as well.
I currently have 3 NOS windshields, including the one from this cab, and I will use the best one, which may very well be the one from this cab