I just uploaded Lurlock's [url=http://mw.modhistory.com/download--15153]Missing Cave Pieces[/url] to Morrowind Modding History and was struck by a thought that they maybe of use for TR's interior modders.
The meshes fill "in the gaps for cave pieces in the Bloodmoon cave set. (And one missing piece in the Bonecave set.)"
They're made in the vanilla style and set to use vanilla textures so, in my view, they'd fit with the whole TR aesthetic.
I have no idea as to their suitability as models, whether they've got flipped vertices or slippery normals or whatever kind of thing indicates a poor model.
In a similar vein (extending the existing tilesets) DonnerGott has released a bunch of "inverted" mesh sets, which, from what I understand, mirror image existing pieces (so where a spiral stair is clockwise in vanilla it's counter-clockwise in DonnerGott's set)
[url=http://download.fliggerty.com/download-135-992]Inverted Cave Pieces[/url]
[url=http://download.fliggerty.com/download--776]Inverted Imperial Spiral Stair Set[/url]
[url=http://download.fliggerty.com/download--761]Inverted Shack Exteriors and Interiors[/url]
[url=http://download.fliggerty.com/download--918]Inverted Telvanni Meshes[/url]
[url=http://download.fliggerty.com/download--747]Inverted Velothi Interiors[/url]
[url=http://download.fliggerty.com/download--805]Inverted Vivec Gondola Dock[/url]
Sorry if there's already a thread and/or you guys already know about this.
Meshes possibly of use?
Moderator: Lead Developers
Glad to here that, Bero 
I saw [url=http://tamriel-rebuilt.org/old_forum/viewtopic.php?p=319015#319015]this post[/url] by arvisrend over in the "Models needed for Morrowind" topic. I can't post replies in there but if you're looking for a palisade model then have a look at Nomad's [url=http://mw.modhistory.com/download-44-4139]Wooden Fort Modder's Pack[/url]
I saw [url=http://tamriel-rebuilt.org/old_forum/viewtopic.php?p=319015#319015]this post[/url] by arvisrend over in the "Models needed for Morrowind" topic. I can't post replies in there but if you're looking for a palisade model then have a look at Nomad's [url=http://mw.modhistory.com/download-44-4139]Wooden Fort Modder's Pack[/url]