I have made some more progress.

Much of the left wing is now framed up with all of the ribs in place, top and bottom spars, shear web and the top stringers.
Also the trailing edge sheeting.
It was quite easy to align the ribs because of the tabs on the trailing end being pinned down (they even left holes in the tabs for the pins).
The sparweb has slots to slide the ribs into, so everything comes together straight and true without too much effort.
The root rib was slightly warped but I clamped a straight piece of aluminium profile onto it while I glued in the stringers. This gave me a perfectly straight root rib.

The manual is quite detailed and isometric drawing of many of the more complicated steps.

Only thing that was a bit tricky was to align the trailing edge sheeting so that it glued tight to the rear tips of the ribs. This is because the alignment tabs are very close to the edge and hard to get clamps on the ends.
Suggestion to Apache is to move the tabs 1/2" or so forward.

One of the steps in the build is to cut a slot in the root ribs between the main spars and epoxy the 3/8" plywood joiner into the pocket that the spars and sparweb make.

Regards

Ari