The wings will have the gear bay cut out of the lower surface. Here is also where you can shape the belly portion.
Gear bay is now glued in place on the lower wing inner surface
add a stiffening card triangle with cut out for the bays.
The wing surfaces are now glued at the trailing edge.
Don't forget to round the leading edge down.
The wings are slipped over the frame and close to the fuselage.
as a note: this is the preferred method to use. In my Mirage build, I tried a a method that glues the lower wing surface to the fuselage first and then fold over and glue over the frame.
wings are dry fitted multiple times, adjusted and then glued in place.
add the wing root fillets. Note that the right fillet has a fairing for a transfer tube externally ( always fascinated by after the fact engineering ).
Isaac