Originally Posted by BEC

My go-to tape for hinges on small RC models is Scotch Multi-Task. But I don't think it would adhere well enough to what appears to be a stained or dyed balsa surface. In looking at the pictures my first thought is an old fashioned sewn hinge.

Another possibility I've seen used with mixed results is strips of Tyvek. There the trick would be much as GH describes for using Kevlar cloth: keeping the glue out of the actual joint but at the same time adhering the strip close enough to the edges of the pieces that they stay aligned properly.