I've set up my Hennessy on the ground a couple times using a couple sectioned aluminum poles from a yard sale pup tent. More room than a bivy sack and smaller than a pup tent but it works well enough if you have a good ground cloth and an insulating pad.

I'd prefer to hang it so I've been on the scout for a sturdy sectioned pole to use for one end so I can attach the other end to any available telephone/light pole, fence post or tree. I'm postulating that with three well-staked guy lines on the pole the weight will be directed straight down on the pole and prevent it from bending. Still experimenting at this stage however.