RE: A few questions about The Bird of Time
A wrap of tape over the joint isn't a bad idea. Another is to put half round "split dowels" on the bottom of the wing so that the edges of the dowels wedge the wings into place on the fuselage. That way the rubber bands both hold the wings down and inward to avoid them creeping apart. A set of such split dowels located at the spar and at the trailing edge will ensure that the wing goes onto the fuselage accurately each time as well.
On a two meter glider that was intended to use the same sort of rubber band option I said "tahell wid dat" and instead I used two nylon bolts at the main spar and two smaller nylon bolts at the trailing edge. The bolts thus hold the wings both to the fuselage as well as preventing any working their way off the joiner rod. As a bonus I don't have a lot of latex turning into weak crud that could fail at some point due to UV exposure. Nor do I end up having to hold my head to the side to avoid a rubber band flying up into my face when I miss one of the dowels.