Ya I thought that the method that the instructions suggest(using toothpicks or pins) seemed abit weak. So I have modified mine with some extra balsa and a couple of magnets. In the first picture you can see the "access hatch" left by the removal of the cockpit area. You have to cut the frount half of the canopy away from the rear and attach to this also. Not too hard just a pain lol.

In the second picture you can see the unfinished removable cockpit area. At this point I had just cut out the outer canopy piece and layed it on for the pic.