Igloo

I need 2 no how 2 build an igloo???

My 8 years. old son and I built a package with 14 "x20" plastic tub with snow Tomak blocks, then turn it over and dumping the finished block. the slight taper of the walls of the bathtub created conical blocks, as we stacked the cone caused the walls to curve slightly inward, a little more each course of blocks. It took about five or six courses of blocks to get the height we wanted. then we sort of concentrated joints with snow by hand. Closing the very top we have done with a guy inside the igloo, and a hand out of the snow pack in place. We then cut a door with such a machete, and used the same method to create the entry. the whole process took several hours, perhaps, and the igloo was in our court in No. Cal. more than a week. a great time was had by all!