First off IO don't believe the glass in the doors is square, the top of the glass is narrower than the bottom I believe so you won't be able to just not roll it up as far as it did. And if the top is chopped and the glass isn't in there you may not be able to get it in anyway. Make patterns out of tempered masonite.
On the windshield, I have never worked on one of those but have on a number of others and there was certainly no glue back then, it was all set in rubber. The glass was pressed into the channel usually and then you cut off the excess rubber that is hanging out. The windshield frame will just need to be cut shorter on the sides. They can often be just cut off, not "chopping" it like the roof post but just cut it off and then the bottom or the top piece will then just be reinstalled. I don't know if you can do this with yours but they are usually very easy. Disassemble yours and see for yourself. If you have a problem post photos and we can discuss it.