You will need some experience to build this AT-AT successfully as there are a total of 69 individual parts in 28 STL files and you will need to wire in a 9V battery, a 90 rpm motor, and a switch to make it walk.  The finished design will stand about 12" tall and walk on flat surfaces, you will need to modify the design if you want sound effects or a lightsaber created hole in the bottom to insert explosives but the basic design is more than impressive.  You can see the AT-AT in action at MAKE:Blog and the creator, Dan Olson, has posted the full project at Thingiverse if you want to build your very own.

"This is a walking model of an AT-AT from the Star Wars films. It is powered by a 9V battery, a 90 rpm motor, and a switch. Everything else is 3d printed using roughly 750 grams of filament."

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