Once the bottom skins are bonded to the structure, I added a couple of small balsa blocks for Robart hinge points to grab.

Now I can start planning bonding the top skin.
In the past I have joined the top and bottom trailing edges with glue only, and it has worked but is more tricky to keep straight while it cures. This time I added a thin balsa strip (1/8: x 1/16) just short of the edge.
On a flat surface, the trailing edge of the top skin is taped to the trailing edge of the bottom skin:



and a very thin line of Gorilla glue is applied.

JG