Structurally, there's no difference in the stress of standing on a specific spot and hanging from it.
You couldn't be more wrong about this. Without going into detail about engineering and characteristics of truss-framed construction, you'll just have to trust me (or not). The force you are going to put on the framing members of the roof system may or may not overcome the truss integrity. As was mentioned, a free standing frame will be a much safer installation than using your roof or ceiling.
Good luck on arranging things, you're to be applauded for trying to make the space your own.
