Hello Erik,
If the wing root fillet's glue lines are clearly marked both on the fuselage and the wings, gluing the fillets to the fuselage fixes the wing position. The transverse joint between the wing skin trailing edge and the fuselage should give a good hint, too! I see, in picture 9, that there is no gap there. So, I imagine that you could choose how to position the wing and get to the same result.
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