Not really reversible then. By reversible I mean that the guitar is returned to it's original condition before the mod, holes to fill, finish to repair would negate that. Even if the holes are filled, the composition of the body of the guitar has changed. Some mods can be done that are wholly reversible, we'll hear in due course if this was one of them.
Not so sure about the neck comment, if the trem is asymmetrical wrt a line through the length of the neck, certainly the load on the neck will also be asymmetrical, but then I'd of thought that that is no different for all guitars. String tension on top three strings is of the order of 60lbs, tension in lower three strings is of the order of 45 -50lbs, hence asymmetrical load.
As in the above, bridge post loads are dissimilar in a unmodified guitar.