Y'know, you never addressed a pretty big issue with this model: the compass points are pulled to the same point. You refuted this by saying that the poles are far away, [like in the round Earth model, but they aren't. The lack of thickness of the Earth means that the poles are incredibly close to each other, and from ground level you would be standing incredibly close to the center of this metaphorical bar magnet, unlike what happens with a globe. On this model, compasses do not work.