[jmk]

Thanks, Fiddlehead.  I'll answer you in two posts. 

Yes, I had a canvas before.  Once the top went on none of it could be reused.  Here is a photo of the old canvas followed by one of the new canvas.   The new canvas dramatically increased the feeling of space inside the helm area.   You can see how much further aft it goes.  

Old canvas (rear section only):
    (click to enlarge)

New canvas:
    (click to enlarge)

For the new canvas, I have something similar to EZ2CY running around the sides and front.  Harder than strataglass.   The sides unzip and can fold inward, which I do quite a lot as it brings the breeze through.
    (click to enlarge)