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I have just finished the installation of my windshield and top window on my CH750 project.   The version of canopy frame that I have - has a diagonal tube across the top of the frame, running from the front left to the rear right position.   Per the drawings and picture guides, I added the two channels to the diagonal to make a slight upwards bulge, ie to make the diagonal have a very slight upwards convex shape.    So, far so good!   On putting the Lexan top window on and screwing it down, I found that I have slight upward bulges in the top window above the sides of the frame, adjacent to the ends of the diagonal.  In other words my Lexan top window does not lie flat along the sides but now has a couple of unsightly upward bulges: one on the front left, and one on the rear right.    I don't know whether this will also cause a problem when my inner top wing skins 'come down' on these slight bulges.   I am reluctant to tighten down the screws at these points along the sides more than I have at the moment - sight hairline cracking around the holes has already started to appear.    I would be very interested in hearing if anyone else has had this problem and what they have done about it.