The Zlin '26 range is one of my favourites in classic aerobatics, I'd love to see a build thread on your Zlin Ken??? The full size has three sliding rails, one either side and another up the fin strake. This leads one to think that the canopy is held with a lug at the front bottom corner of the canopy and a third one in the middle of the rear curved section that locates into the fin strake.

Ian.