I have some nitpicking to do...
Change the LUA to have the Imperials as "imp_inf_basic" and the pilot as "imp_inf_pilotatst" instead of imp_inf_basic_tie and imp_inf_pilottie. Then you'll have the proper pilot skin.
Instead of calling the Tusken Raiders and Jawas as "Tusken Raider \ Jawa", I suggest you just call them "Native" or something.
And you probably already know, but the Tusken Village captive is undefined.
How 'bout a few AT-AT's? You could use Saturn_V's Sandspeeder.