An hour here and there doesn't seem like a lot of time but every hour counts and is productive when building.
The diagonals dried overnight and the wing is now incredibly sturdy. Using off cuts of 140mm x 45mm from the bench build as supports between the spars, holds the wing inverted and off the table.
1-1/4" squares cut from 0.8mm plywood for the trailing edge gussets. Marked along the bottom of each inboard rib to position the gussets 1/2 on the rib and 1/2 hanging out in fresh air. The trailing edge will be fixed in place tomorrow after they have dried.