With no outside access from the basement, it sounds like your predicament is very much like mine is. If you can get a flat 4X8 sheet of plywood down there (without bending it), you might be able to build the 9' long wings in the basement. My back was against the refrigerator to take the photo. The door to the right opens to the garage. By temporarily removing the hand rail and support post and rolling the refrigerator out of the way, I was able to get the -6A wings out of the basement without too much fuss, even with the fuel tanks attached. This time around, even those will be removed. When devoid of flaps and ailerons, the wings are light and small enough to lift and manipulate by two people of average strength. My suggestion is to fab up a 4' X 9' plywood "mockup" and see if it is possible to move it through the area. If you can do that, then you can build the wings in the basement.
