Fabulous work Jon, and great pictures to match. I think you not only must be a good builder but it takes a bit of artistic talent to pull this off.
Fyi:
I believe the Inuit leave a small hole in the top to let the smoke of cooking out and to let out excess heat and some fresh air in. They stick some dried grass in the hole, rather loosely. They never seal the igloo completely. On one side they build a small snow shelf for cooking on. Eskimo stoves are kind of cool and very simple.
On the other side they build up a snow shelf big enough to sit/sleep on. Remember that cold air falls to the floor, so just raising your bed a foot or two puts you into a considerably warmer layer of air.
Disclaimer: I have no first hand experience with igloo building or living but I read this somewhere. I believe it was in "The Book of the Eskimo." The author's name escapes me but I want to say Peter Freuchen (?) It is an old book and it is a classic of the far north.