Here's some of the information from Dragon #83:
The Hut's appearance
Baba Yaga spent much of her early life constructing the Dancing Hut, which now serves as her mobile fortress, home, and helper. The Dancing Hut is a small, windowless log cabin, hexagonal in shape, with a decorated wooden roof. Only 15' wide and 12' high at the peak of the roof, with a small chimney on top, the Hut does not appear very impressive--except for the 12' long chicken legs coming out from the bottom.
When first sighted, the Hut will usually be "dancing" by spinning about rapidly on its feet. The Hut will make about one revolution every six or seven seconds, with the feet stamping the ground every half second. If someone is entering or leaving the Hut, the legs will fold up into a 2-foot-deep crawlspace beneath it, so that the Hut rests on the ground. If so commanded by Baba Yaga, the two huge legs can move the Hut at a very rapid pace (48" over smooth ground, 36" over rough terrain or swampland, 24" through woods and mountains). About 2' thick, the legs are treated as AC -2 and may only be struck by magical weapons. Each leg has 45 HP, and if damaged by weapon blows will regenerate 3 HP per round. As noted below, the legs are immune to all magic.
When attacking (if commanded to do so, if attacked, or under other conditions described below), the legs strike as 10 HD monsters, once each per round, for 4-24 HP damage. If a leg catches a victim with a score of 4 or more over the roll needed to hit, the victim's arms are pinned by the claws, and the attacker may be crushed to the ground for 4-40 HP damage (40% chance), or hurled 20-120 feet away for 1d6 damage per 10' thrown (60% chance). Thrown characters must make a saving throw vs. paralysis or be stunned upon
impact for 2-12 rounds, unable to move, attack, or defend themselves. Crushed characters will be hurled away in the following melee round.
No matter whether the Hut is spinning, fighting, or running, the interior will remain stable and calm, because of its extraplanar construction. Other powers of the Hut may be used under Baba Yaga's direction, and they are described in area 46 below.
The Hut itself is powerfully enchanted. Close examination will show fine magical runes covering every square inch of its outer surface. The Hut's exterior (including the legs) is not affected by any magical spell, and it will reflect spells cast directly upon it (such as fireball, lightning bolt, or magic missile), inflicting them on the caster. Area effect spells not centered on the Hut will not be reflected back, but they will not affect the Hut, either. Though the walls are made of wood, the Hut is immune to all forms of fire, acid, cold, water, and lightning. Physical attacks have no effect upon the cabin section of the Hut.
No form of divinatory spell, not even a wish, will reveal the Hut's current location (its protection resembles that offered by an amulet of proof against detection and location).
"You'll find it when you see it," say the sages.