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You don't understand the paper wing construction Sweb I'm afraid.The lower wing chord is always smaller than the upper one in order to bend it according to the airfoils.Usually there are a few of them and the main iron inside to make the whole wing stiff and of the correct dihedral.
Ummm... no. Read my post again. I measured the lower chord on your illustration to be in the region of 10% less than the upper for the very reason you mention - regarding airfoil curvature of upper wing half over the lower wing half - so that the OP could plan his flat pattern layout accordingly.
I have changed my mind about the wing tips though. Cut them off and use balsa or styrene rather than trying to coin the aluminum.
Nice Igor. If you ever want to try moulding canopies, let me know, and I'll post a short, illustrated description / tutorial.