Correct, in most. The thickness of that wood portion may vary though. For example, there was only a single piece of 3/4" wood on the outsides of the transom on each side, but the area in between the engine stringers used a second 3/4" board on top of it to give 1.5" of wood in the center to allow for the correct tolerances for the transom plate/outdrive/etc. Some may use 1.5" all the way across.