Check out this amazing fan made documentary Building Empire by Jambe Davdar. at the 4:21 mark it shows clips from the movie as well as behind the scenes of their attempt of a full size Wampa suit. Sadly it did not work and get the on screen impact that they intended. Watching them attempt to walk through the snow in stilts and falling over is somewhat comical but at the same time I wish worked and made it in the film.
Because of the failure of the suit an entire Wampa attack subplot inside the rebel base was cut from the movie (see below). Who knows maybe we will see these scenes digitally remastered in the upcoming Blu-Ray release. They have teased us that some highly anticipated deleted scenes will see the light of day.