A belt and braces answer, I have used the double sided tape, but!!!, cut the width by about one third, put this in place allowing a decent overlap of the clear styrene, this way you will have your glazing in situ, now the the braces bit, with a cocktail stick gently apply canopy glue around the edges of the clear styrene, this way you don't have the annoying slips that inevitably happen when trying to fit and glue at the same time, I developed a lot of grey hair before I adopted this method. Howard Q.