I bought a PrimetimeLite from Dicks sporting goods, 22lb.
Never thought about just using the top for a seat before, it would work though. I mean with mine I would be suspended, very comfortable, shooting rail optional. Except for the carry straps are set up on the bottom part I think, yeah. Point of safety: this would mean disconnecting the jam rope preventing the bottom from dropping out. Wouldn't want to ignore that imo.