Does anyone have experience with the Sierra Designs Mountain Guide Tarp? I cant find detailed pictures or reviews. This tent is sparking my interest because it is 4 season, only weighs 6 lbs, and and is over 100 sqft. I am wondering if this thing has a bottom? It is 4 season, but I know a lot of these shelters do not have a bottom or it is sold separately. Any information would be appreciated.