Indeed!

But....I dont mean to sound like a kill-joy with these fantasic ideas coming up now, i just think we've got to be a little more realistic here.

Yeah, the Tie reveal in a ANH:R was one of those jaw dropping moments (even if some didnt like it!) that brought the movie upto date with current technology IMHO (ive always wanted to ask you how in the hell you did that, yet i prefer not even knowing).

But, creating 'moving' AT ATs in computer graphics that fit in with the existing footage, would be something even a studio of computer graphic artists would struggle to do (never mind recreating actors to add extra scenes here and there).