There is one module which was almost in tact and possibly part of Sleheyron. It only lacked the files making up the module itself, but I managed to put together a blank version.
There was also a Rakatan temple on Tatooine originally,and an area of Kashyyyk.
You can find them here
(I don't remember exactly, but I think all three are in the '3lostmodules.7z' file. Just download and extract (I think the Czerka depot may need to be compiled as a module first, but I'm not sure on that front - I uploaded this quite a while ago...)
If you download them, you can have a look round, but there's not much to see - they're empty. If you'd like to have a crack at using them for a mod, feel free (although a little credit for salvaging them wouldn't go amiss
@TK: Nice planet
EDIT: Almost forgot to mention, we at Team Jawa
are currently planning to restore these areas (and much more) to KotOR