Thanks all for the congrats; there is much work left to do, and I will be posting progress on the blog, and coming to this thread now and again to update, or ask questions.
@Francois; The hole has been dug, and the box set: next is insulation, and a pipe system to temper incoming air. Then we have a lot of dirt to move, but the front entry will be left open for construction of an ante room for sink and storage and processing. We will be running power and water to the structure. Once the ante room is completed, the whole shebang will get buried under lots more earth. A ventilation system on a timer is planned, to remove ammonia, and exchange fresh, humid air. If the temperature is not low or stable enough, provisions for a coolbot will be made. The one side of the cave entry is planned for mechanicals. I posted some slides of the next steps on the blog, as the rain this week has left nothing else to do.