ORIGINAL: LuvBipes
Nuvaring, I had the same impression as you regarding the wing joiner, so I went ahead and fiberglassed the wing center section. I now have about 30 flights on the plane - it's powered by a Moki 1.80 and I'm very pleased withg it. It only weighs around 13lbs, so flies "light" and has no bad snapping tendencies.
Honestly guys, I would not worry to much about the wing joiner. Cap #1 had an off field excursion that snapped the firewall right off the plane. Once I got the replacement I reused the wing from the first one as it had no damage and it's joined with Gorilla glue. I also am using a DA50
I'm into 70+ flights on mine and that includes very violent full throttle wingtip (KE) spins, loads of tumbles, several failed attempts at waterfalls and a host of high speed snaps. If my wing has not failed by now.... (I do tend to strip the plastic wing bolts now and then, most likely from over-tightening them, but sometimes they do come out bent [X(])