I plan to fully sheet the wing and add flaps, so I had to do things a little out of order from the manual. Namely, I need to sheet the bottom of the wing first so I can route the aileron pushrods.

So at this point, I had to install the retract rails.

Again, instead of adding the rib doublers to ribs 3 & 4, I added them to ribs 4 & 5.

Then I placed a retract between the two rails (With a small spacer shim which is just barely visible) and once they were lined up, I tack-glued them together so they would hold their relative position while I installed them.

Once they were epoxied in place, Tri-Stock was added to the undersides and after the epoxy had set, I knocked the braces off.