I too, am having serious problems with the wing cabanes. 2nd flight, and the screws that hole the steel brackets were backing out. After dissasembly, (at home) I applies some aliphatic resin to ALL the wood screws on the plane. After a close inspection after the following flight, I couldnt believe my eyes! The steel brackets on the front cabane were cracked and seperated, and the one of the rear steel brackets was cracked too! The problem is quite obvious, GP has neglected to take into account the affects of high frequency vibration. Large olanes use large motors, and this vibration is unavoidable. Certainly, I balance my props and noticed no unuseual vibration on this model. I can only be thankfull it didnt go in like some of the others have/will. I designed a machined piece, that will replace the crappy little steel brackets that come with the kit. Also, I will have to cut the wing open, to make sure the supporting structure will support a slighty larger cabane mount. What a shame this was overlooked by GP. It kind of makes you wonder if they bother to test fly their stuff before it goes to market. Im bugged by this.