a) TSLRCM is also hosted at moddb.com.
b) I'll only list released mods. Here are two ideas to get yourself started . . .
Coruscant Jedi Temple by DeathDisco
Tomb of Azgath N'dul by Darth Insidious
(use the patch here
and the corrected INI file here
for bug fixes and compatibility purposes)
c) Could someone confirm if Newbiemodder's Korriban Expansion
is compatible with TSLRCM 1.8.1?
d) Don't use Cathalan. Trust me.