Mine fit pretty well. A high-quality product.
One thing you can do, to make your life easier, is to get one of those rubber plugs (I don't know the proper name for them), you know, like the ones that go in the holes in the stamped steel floorpans of cars, for draining water out of the spare tire well and stuff like that? Anyways, drill a hole, or two holes (one front and one rear), so that you can drain rainwater out of your belly pan between sessions.
