AT AT

AMT/ERTL makes one.  problem is, they're fairly crappy.  here's a review:
http://www.cybermodeler.com/hobby/kits/amt/kit_amt_at-at.shtml

  I actually like the kit...for fifteen dollars, it is a steal.  Yeah, it takes some filler, and a little bit of work, but it is by far the best of the Star Wars kits.

Yes with a little effort it can be made into a nice kit. I changed out the main chin guns on mine with barrels from a couple of 1/72 scale German Pak howitzers. Looked better. They just re-released the kit, too. You might try the Starship Modeler store.

Excellent looking finish on this build.  Do you have anymore photos!

There's a bunch here, as well as the backstory, and one little Darth figurine that is somewhat amusing:

 

http://www.finescale.com/FSM/CS/forums/551024/ShowPost.aspx