Thanks for the comments, everyone! I've finally uploaded some higher-resolution pictures to Brickshelf, and included some of the construction techniques (for the chairs and warming hut roof) and bullwheel/tower test setup I made before creating the final model: http://www.brickshelf.com/cgi-bin/gallery.cgi?f=458290
@ Cecilie - I did try to get it functional (you can see the test in the pictures in the link), but the strain on the bricks from the required tension on the string was too much, and pulled the towers apart (you can see in the test, the bracing between the towers). It might be possible with gluing/screwing the towers, but that would have likely violated the "only LEGO parts, no modifications" rule of the contest :)
@ L@go - the hut I patterned after Horstman Hut in Whistler, Canada; it has a brick oven for cooking food, a cash register on the counter, and a picnic table for the guests.