Indeed it is a plexiglass window. That body was one of mine that I rescued from an Arizona junkyard and gave to Bob. He built it but the shop I worked with painted and lettered the car. Bob had over two dozen HUG's since the first 65 was built, so there is no such thing as a clone if he built it and drove it! BTW, that body was an original 383 4-speed but was completely stripped when I got it. He had put a couple of innovations in the 69 car that he always wanted to do. He has another body now and it will be back together sometime this year. I had to go to Mecum in Wisconsin before Mopars at the Strip to retrieve his 68 car so he could make the last run at the show. It is only the second time he had ever wrecked one of the HUG's in 50 years!