A little Mystere

Every now and then I get a kit that offers a new challenge. Take Fonderie's Super Mystere - nice resin parts, lovely engraved panels, even the fuselage fit is not too bad. But which way up are these wings? Oh wait, the wheel wells give it away. There are no tabs, pins or lugs to locate them.
But the wing stubs are chamfered to give a distinct dihedral.
So, how to mount the wings correctly? That's next.