RE: Rubber bands or Nylon bolts for wing?
Although I am in favor of bolts over rubber bands, I would exercise caution in converting a plane designed for the rubber bands to the bolts. The problem I see is making sure the leading edge dowel(s) pass through plywood or similar back at the main spar. If you are confident there is some support aft of the leading edge you can glue to, then I would say go for it. Otherwise, stick to the rubber bands and go for bolts on your next plane.
DaveB