if you need to make this movie epic (ha i love that word) and on a cheap budget u can get big scenery shots and vehicles and large structures all with computer animation with stationary stuff where it doesn't have to be moving animation, its a million times easier, u can make still shots and add em to the background, like a pelican could be added to the launch bay of the poA and a building could be added to the background, stuff like that, if u can find someone who can do that (i'd look over on halo mods forumns, theres a bunch o animators over there, they even do walking animations and stuff for character models) orlook up 3dsmax, its an animation program, 3dpalace.com or something like that, hosts a forum alll about 3dsmax, and if you look at some of there stuff, u'll see what i'm talking about, they makke cars, that look like real cars, and robots that looks like real metal, i mean it all depends on how good ur guy is, but u could achieve some awesome effects with comps, anyway good luck, and finish that trailer i wanna c it