I put my body on sawhorses and the frame underneath. Not ideal but not as terrible as it sounds. Hanging the body from the rafters sounds a lot better. If your ceiling isn’t finished, wrapping a rope around the rafters wouldn’t cause me to have a second thought. Screwing an eye hook in the rafters might because I am nobody’s carpenter and have no feel for that. Out of an over abundance of caution, I might use two eye hooks at each corner spread about six or more inches to spread the load.