[6t8stang]

Just went through this last year with my dad's windshield. The fabrication really isn't that bad. We opted to test fit, mark where to cut & holes lined up, pulled back out to drill/cut, then reinstall. We also took the extra time to remove the legs from the windscreen when cutting/drilling just to be safe. Really not that hard - just take your time and measure twice...and elongate the holes in the legs a little bit to give yourself some adjustment.

Also keep in mind when switching to a different frame, your wing windows and visors will likely no longer fit...you'll need to buy ones made for the new frame or you'll have to drill/tap new holes and risk hitting the glass...

Having gone through all that for his car, I think I'll opt for Lexan should mine ever need a new windscreen...