Pete1burn,

I built my Avistar about 7 years ago and its still flying great. I'd recommend epoxying the inside surfaces together, this will add some extra strength to it. id use 30 minute expoxy for all the wing joining steps you mentioned. 30 minute is stronger, stands the test of time, and will allow you more time to clean up the excess epoxy that leaks out with rubbing alcohol. make sure not to flood the surfaces tho, a light coat will do also make sure you have equal portions of epoxy (very crucial) and use a throw away brush to spread it on with. Good luck with these steps, they always were the most nerve racking for me