Thanks so much for your comments, they're all VERY much appreciated.
About the protruding windscreen: I modified the glass on this one to partly address the problem so it's not as bad as it could be. If you install the windows (front and rear are one piece) as per instructions it will look pretty odd.
Steve, interesting that the windscreen on your (beautiful!) Chrysler, which would pre-date that on my 80s release DeSoto, seems to be a different piece altogether.