Via Instructables.com:

This project was born out of admiration for the Star Wars universe, and vehicles created for the movies. Imperial walkers are amazing machines, and the AT-AT the main example of this class of vehicles. The idea was to take advantage of the same design to create a trinket box produced in 3mm MDF, which once assembled has dimensions of 19.7in x 15.75in x 5.9in.

The piece was drawn on the basis of the drawings available in wookieepedia (detail here), which have been simplified to suit the material and the expected functionality to the piece. One of the goals was to prevent creating something very static, so it was decided that the legs could have their adjusted position, allowing put the AT-AT in different positions, from 12 existing joints.

To build it, you will need:

MDF 3mm;
one router / laser cnc (this model was produced using a router and a bit 1.5mm) ;
8 M3 8mm screws (diameter equivalent to 1/8) and nuts ;
12 M3 12mm and nuts;
glue (cyanoacrylate or specific to wood) ;
acrylic paint, if you are inspired to paint.

Click below to read the full instructions.