Thanks chaps.
Canopy glue is definitely my preferred option Ray, although I'm still considering some sort of deck-level channel section to hold the screen. I'm not keen on a simple glued butt joint because I'm not sure I can make it neat enough.
No glue on the deck as far as I'm aware Ashley but I'm going to double check now you've said that.
BTW, the chosen colour scheme is No.2 – the most popular and, as luck would have it, my favourite.
Graham