I've taken a corridor mesh and copied it several times over in blender, creating a single mesh that is much longer. It renders in the creation kit, but doesn't show up in game. Also of note is that the bounding box only shows up over the central part of the mesh, which is the original piece that was copied. I checked the'Is Full LOD' box, but that didn't change anything.
Is there something I missed, or something else I need to do to make it show up in game?

This is the mesh in question, if it'll help

http://www.mediafire.com/?c5e1x0f1id87ech

Tried a different version of the same mesh, one that was extended in nifskope. Still no luck.

Someone had told me to replace the BSlightingshaderproperty nodes in Nifskope, tried that, still no luck.
As I've said before
http://img836.imageshack.us/img836/1230/hmmmlw.jpg
That corridor is just one mesh, but as you can see the box and the collision meshes only seem to exist at one part.