My gaming group did it with Wizards of the Coast's Star Wars Miniatures. I'm hoping the larger battle rules in the Hoth expansion will eventually lead FFG's Imperial Assault to this:

Love it. I own a buttload of those minis, but only one ATAT and one ATST. A match like that would be so awesome (Though would likely take all day!)

Though the nature of the tiles in this game makes me feel it'd be very very unlikely we'll be seeing anything like this in IA.

Though the nature of the tiles in this game makes me feel it'd be very very unlikely we'll be seeing anything like this in IA.

Well the huge ships in Xwing are rarely actually used (if at all) but they're still there, mostly for decorative purposes.

Though the nature of the tiles in this game makes me feel it'd be very very unlikely we'll be seeing anything like this in IA.

WotC's SWM used the exact same-sized squares on printed maps. I already have the Hoth maps.

Thanks for this. I have several of the SWM maps handy I was wondering if there was going to be rules for larger scale fights. Did you come across any homebrew rule by any chance? Combining IA with SWM?