Cabelas has an insulated 7'x13' ice fishing tent. They are stand up height. Come with tie downs and anchors and weigh about 54lbs. They are easily set up by one person and even easier with two. There is plenty of room in them to do what you are seeking. A big buddy heater heats them well at sub-zero temps sitting on ice so would work great on bare ground. If you use something like that get a CO monitor, cambodian tire sells them for $35. Great investment. You can pick up interlocking heavy foam matting too for a floor if you want. Its not too expensive and would get you off the dirt so to speak if you don't want to sit around in shoes and boots constantly.[/QUOTE
A BIG 10-4 ON THE CO DETECTOR. Last fall we were late setting up our bivouac for moose hunting and didn't get the wood stove burning and so we flashed up a Buddy Heater to keep the chill down. Some time in the night my son heard an alarm on the Buddy Heater that said CO alarm. He shut it down and opened the door and checked everyone was breathing. All was good but so much for heat that night. BE CAREFUL.