I thought I'd share this with my GT40 friends. I took all the plexiglass from the CAV and masked all but 5/8" to the edges. (inside surfaces). A bit tricky but patience and good blue masking tape resulted in a satisfactory tape job
Cleaned thoroughly with rubbing alcohol, and then spray painted them black.
What it did, basically, was hide the sometimes not-too-neatly-applied gasket material under the glass. A nice weekend project.
I think it gives the car a more "finished" look.