I had traditional soft clear vinyl enclosure on the sides and across the stern of the 1972 Hatteras YF bridgedeck. Over time, I made approximate 1/4" thick acrylic side windows and fit them into single channel ss top,front and bottom since I never bathered to open those. These happened tro be fixed in place, but with a double SS channel and smaller acrylic might have been able to slide open. However, the roof was sloped and the top of the handrail at the bottom were not parallel, so 'sliding/opening would have required a filler pice to make top and bottom parallel.
Across the back, much simpler: I added two button type fasteners [analogous to what I think GJH described] to the bottom of the soft vinyl 'curtains'. Instead of having to roll up the curtains and get them into nylon straps under the ceiling, I could just lift them up and snap buttons to the underside of the roof[ceiling]...
It was a fantastic change, one of the best and easiest: In chilly weather, whereas I could not even get the vinyl into a small enough cylinder, and would have scratched it if I tried, now all I had to do was unzipper the "U" shape along the bottom and sides, and lift and snap the buttons to their ceiling counterparts. That section was now open most of the time except for cold weather and rain.
