Alliance are a serie of different mods. On the Star Wars GC, you can play the civil war Empire vs Rebel era + Black Sun and soon the Republic and CIS.
I have made a new walker for the Corporate Sector, the Espo Walker 101, of course there will be a 91 but I have started by the 101, but both designs are very similar.
Starwars.wikia.com
Starwars.wikia.com