I have resolved a few issues, and now I am attempting to tackle the interior of the castle. I have created some new meshes and interiors that adjoin the existing Castle Volkihar Guildhall. In the CK, everything looks good. In the game, I can not see my new areas where they join up with the old areas until after I have walked into the new area. It is very strange. Collision works fine, and as soon as I've crossed over into the new tower I can see everything, but before I do my new stuff is invisible. I have posted screenshots here:

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http://www.nexusmods.com/skyrim/mods/58136/?tab=3&navtag=http%3A%2F%2Fwww.nexusmods.com%2Fskyrim%2Fajax%2Fmodimages%2F%3Fid%3D58136%26user%3D1&pUp=1#

Any advice would be welcome