Best method of mounting Revell's 1/28 Sopwith Camel top wing. It looks daunting.
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Create a card template for the cabane struts (the ones from the fuselage to the wing. Glue the cabane struts to the fuselage, then hold them in the template with rubber bands so they dry at the correct angle. Once they're dry, you can glue the top wing to them. Allow that to dry before gluing in the wing struts.

Be careful; the Revell kit's wing struts are slightly too short which will cause the upper wing to bend when it shouldn't. You either need to lengthen the wing struts or bend in a little bit more dihedral to the lower wing to keep the upper wing dead flat.