http://diydrones.com/group/x8 started a x8 group if you want to throw some ideas around
I kevlared my bottom half front X8 Nose. I've drilled it in at least five times. Still OK. Good stuff. And I just used epoxy for it.
KEVLAR used in fabricating is different from ballistics grade KEVLAR. KEVLAR 49 is used in laying up fabricating and KEVLAR 29 is ballistics grade "bulletproofing" material.
My plane is totally cover on fiberglass! a bit on the heavy side but I'm a happy camper wit it! Perhaps what I think that is the heaviest is the landing gear do!
I would say that due to the extra weight the power plant have to be stronger!