I began by stuffing the open areas (the guts, basically) with aluminum foil. I continued by stretching metal screen over the form in order to hold the foil guts in and give the surface "tooth" for the wax to adhere to. I then secured it all with wire.
(all that stuff behind the figures above is what's on the shelf in my home studio)
The torsos are now covered with a basic layer of wax. Tomorrow I'll begin on the heads and legs of the figures.