I had to look. The oil drain is the approximate center of the block. On my jackshafted old style doodle clone the drain is in the center. The right side appears to stick out but that's because of the starter housing. When you add the clutch guard on the left side you get it more balanced looking. On the motovox without a jackshaft the drain is centered as well. It also has a plate. Again it looks balanced because of the starter housing and clutch guards. The jackshaft will actually push it more to the right the way I have mine setup with the clutch inboard.
Hope that helps