Caedes, point well taken but it is a language issue, in short terse sentences, only the bare essentials of a thought are expresses. When I mean gravity-neutral, I talked about the effect inside an onion-like layered entity. If you
Follow the the graph line of the strength of the gravitational pull from the maximum at the surface (if any) to the zero at the center, one realises there is a steady or incremental decline. This means that the layer above, like layers down a mine shaft have CRASED to contribute to the strength of the downward pull. how otherwise could the force have declined? It follows that if the inner layers of your choice could be removed, there would be no gravity force left.
What gravity is, a property of mass, a tensioning of space, an exchange of graviton-radiation, the action of the Hicks Boson, does not matter here. The intriguing question is, with all that mass pulling in all direction at the center of mass, if there were no pressure, would one be pulled apart by all the outward masses' action? apparently not, Gravity forces CANCEL each other out. Globular Star clusters, Elipticals seem to have managed to deal with gravity without a common rotation*. but like you said,
These ideas are fine in an ideal scenario, like the Laws of motion of Kepler, working only for point-masses. You do not want to be OVER-MASS (you can not be overweight) floating inside that gravity-free cavity and pull the fragile ceiling down when coming too close.
Vidiot. you are right there never was a real water canopy,
it was ICE, ice cream castles in the air--Joni Mitchel.
* WT and other central command structures must hate that concept. Yet it exists in nature.