Somehow I have managed to miss this build. Glad to see it's back on the bench. Things are looking good so far. I'll be tuned in for the rest of the build.
I have the same kit on the back burner, been stalled for two years now, but hopefully It will be back in action soon. I'm building mine as a '72 with Lusso trim. I sorted the windscreen the same way as you did, but still have a small amount of distortion. I may take another shot at filing/sanding/polishing to improve it further. I glued strips of plastic from the inside of the window frame to hold the windscreen in place. I'll put up a pic when I'm back at the bench to illustrate.