Try Central Hobbies and look for MK Magic Box...... they have 2 small levers that stick thru the side of the fuselage. You move oth of them aft and it releases the canopy. To attach the canopy, just move the levers forward and snap the canopy in place. Pretty slick. Little tricky to install, just takes a little patience to get things lined up right.
Here's a link
http://www.centralhobbies.com/miscel...s/mkmagbx.html
Or you could go slightly 'old school' and use a Hatch Latch. Also at Central Hobbies. They work equally as well if installed properly, just not as 'nifty'...
http://www.centralhobbies.com/miscel...s/bviolet.html
Woodie