?? The wing at the middle of the entire wing (i.e. both halves) is going to be a lot wider than the MAC. The MAC will be at a point farther out than the joint with the fuselage. And, as a couple of us have said, why think the instructions would pick the point where the MAC is to measure the CG. If he does it half way out each wing half, he'll probably get a GG way too far back for safety. Perhaps we have misunderstood your message. If so, clarification can't hurt. Reading his first post again doesn't seem to help.