Birth of a 1970 Dart Convertible

Here is the picture of the car that is going topless. I started cutting away at the conv. today I removed the right rear quarter panel trying to save it Dustin and myself didn't do too bad. Let me tell you there is a lot of a spot weld to remove to take it all apart. I think that I can take it all out in 1 piece but when the reinstall starts it will all have to come apart. I was just wondering anybody had any ideas how to measure the windshield frame before I remove it so when I install it to the same angle?

I did a 66 dart and had to replace the total front cowl section.
I measured these places to get the correct angles
View attachment Angles to do.JPG
and made an alignment jig to hold it there while I worked on the car
the middle and top line (5 inches from middle line is critical and all the cars (sedan, hard top convertible ) that I've measured had it in the same location my 66,65 and a 64 were all the same also a 67 & 68 measure the same(different than the 64,5,6 though. the bottom line was just to make sure I didn't flex the door opening