As slow and underpowered as this thing might be, I'll settle for what the Wright's did on the maiden!.
I plan on using bamboo skewers to act as interplane struts that are simply stabbed into the wings with a dab of glue. Once the thread cross bracing is in place, it's hard for me to imagine how to intentionally warp a structure [for roll control] that is braced so well to resist warping.
I realise that it doesn't take very much of a warp to cause the plane to bank, though.
A properly built airframe in this scale would look great built out of birch dowel, maybe with a light oak stain and of course covered with tissue and dope.