1936 Windshield picture & advise needed

[roll of the dices]

Hi everyone,

The windshield I have ('36 ford truck) for my project has the side screws so deeply rusted that I haven't been able to remove them.
I tried a wire brush, WD40, PB Blaster, diet coke bath, heat and the screws are not even moving or coming loose. I am thinking of tapping, drilling them and maybe remove them this way.

Anybody has any advise on how to remove these stubborn screws, other than the mentioned above?

There are some repairs that I will need to do to the frame itself, to remove some rusted through areas on it.

Anybody has a picture of how the windshield comes together? I see the frame itself is two halves that meet in the middle and attaches with the 4 screws...are the 2 halves separate and a 3 piece in the middle, inside of the frame, that joins it with the 4 screws? or does one half actually goes inside the other and bolts on the middle?

Sorry, I've never seen one apart and could use a visual before starting to cut or trim for repair. It was hard to find so I don't to risk it :-)

Thank you in advance