RE: Wing joiner play...
Dan,
Once again I do not know if this is even necessary for scale flying , but I will tell you what I did. I removed about 1 1/2" of covering from the top and bottom of each wing half prior to joining. After joining (and curing) with the new maple wing joiner and 30 min epoxy, I used SIG SH226 pinked glass tape and more 30 min epoxy on both the top and bottom of the wing. After curing, I applied a very thin additional coat of 30 min epoxy for final smoothing. Once this cured, I sanded the joint and recovered the center with a 5" wide piece of coverite fabric (same stuff that the plane is covered with). I looks pretty good and now I am not worried about wing fold. The next area of concern are the strut ends. I am hearing that they (the hinge material) will tear after some number of flights. All in all I think this is a pretty nice ARF - especially for $179 (Tower sale price). With a few mods it should be a pretty nice plane.
Steve