This is interesting... I'm guessing it's a Sig kit with a custom 3-piece wing, although normally Sig wings are built as 1 or 2 piece. The wings appear to have been modified to hold a servo in each wing, so you'd only have the servo extension wire going back to the fuselage, which is a fairly common practice. Some earlier Cubs were designed for a center servo and bellcranks, I've got an old wing like that waiting for eventual restoration. The wing struts are also a little different from "normal" in that they don't have jury struts, which both Sig and Balsa USA use. It's possible your plane is from a different manufacturer, however. Maybe a couple good shots of the interior would help, as I could compare against the construction of mine to see if it matches how Sig and Balsa USA laid out the parts.