To anyone who's interested, I have released a plug-in that attempts to do away with floating rocks, openings in and between meshes, and general gaps in the landscape. It does not touch objects fixed by the Unofficial patch or by other mods. The current version corrects over 200 issues with major patching in the Deathclaw Sanctuary area as well as the regions around and between Raven Rock and Fort Constantine. An Open Document file that contains a list of the reference numbers of the objects affected is also available for the curious and as a modders reference. You can get the plug-in http://fallout3nexus.com/downloads/file.php?id=15600