Hi Tom
I found this pic of the YS53 just after we bought her...talking canopy stuff...this a/c had been flipped over in the big gales in 1987,the main canopy had been replaced by a K13esque affair,but as you can see the rear canopy had been replaced by a plywood cover with 3 portholes.Over the winter I cut away the front half of ply and replaced it with 3mm acrylic sheet,you can see that in the other pic i posted earlier,the remaining ply was still silver primer at that time,my syndicate partner was impressed by the vis improvement