AT-AT for America is a crowdsourced project that aims to build, no fooling, a fully fuctional, full-scale model of an AT-AT Imperial Walker from The Empire Strikes Back. They've gotten preliminary approval from Kickstarter to make it happen, so it sounds like they just need some funding plus a bunch of engineers from Kuat Drive Yards, or failing that, an alliance of Earthlings with a level of mechanical expertise equaled only by their hardcore sci-fi geekiness.
In case you were wondering, an AT-AT stands nearly 75 feet tall and has a maximum speed of just under 40 mph. It can carry 1 ton of cargo, or up to 40 Imperial Storm Troopers.
One Man's Plan To Build A Full-Scale, Functional Imperial Walker