Mentioned earlier, one lug was longer than the other. Before filling or gluing on the model the longer lug was cut to the length of the shorter one.
The launch lug wing support seams were filled as normal with CWF.
The lugs will tuck into the wing/body joint so glue lines are made small and thin. Glue could end up on the wing or body tube.
The lugs were set into the joint using tweezers for more control. It would be very hard to place them using just your fingers.
After the glue dried a fillet was added using Titebond M&TG. You certainly can't reach that fillet with a fingertip to smooth it out. A Q-tip can help.