The front wheel well actually looks accurate to me. As for the rear I see what you mean Miles. After looking at some other pics it looks like the rear wheel opening is equal to or just a touch higher than the top of the front wheel well. Using that as a guide I suggest measuring the distance from the top of the front well to the table and using that measurement to determine the top of the rear well. Using a pill bottle or some other round object I would trace the rear opening starting at the mark you made. I'm no expert, but that's what I would do. Good luck with that build.