I use a piece of Tyvek into which I put some rivets for string and attached some mosquito netting to the bottom. It's supported with one old pole from a dome tent with a piece of bamboo from my yard. I cut in a door made of mosquito netting with a zipper (from an old, discarded tent) and I have an extremely large tent that weighs in at well under a kg, including the stakes and a piece of plastic that I put under my sleeping pad. One night on the Lost Coast I stayed warm and dry all night in spite of seven inches of rainfall. I was thankful that I had room to cook inside the tent that evening. It isn't pretty, but it's light, large, cheap and functional. I'm a bit like that, except that I'm quite a ways from light.