Here are some additional links that may help...http://www.youtube.com/watch?v=kRUt5I-pNuUYoutube video of my rocket and a group of others from the MAK...
Step 8: Glue your Fin Supports
This is the added step for extra support. Glob out another dab of Epoxy and glue your triangle to the bottle and the fin. Glue the Supports on each side of each fin. Wait approx 10-15 minutes to be sure Epoxy has set.
Guess what... Your done all of the assembly at this point!!
You could take this rocket to the launcher at this stage and let it rip!
BUT... it's kinda messy looking isn't it?
One more step...