I thought the a/c recepticles should not depend on the box sitting flush with the face of the plywood. The ears (metal tabs above and below where the mounting screws go through the device) are made to sit on the face of the wall. You only tighten them into the box far enough to get those ears sitting on the face. Then put the cover on. If your plywood is cut too big around the box (like you said a few are) I think you can place spacers over the mounting screws so that the device will tighten to the box and be the right depth for the cover plate to attach and sit right on the wall surface. Seems to me I remember seeing these spacers in the electrical tidbits isle at Menards/Home Depot?
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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