Since the subject has arisen here's my solution.

There are a fair few things to take into consideration when contemplating making a hammock stay off the ground. You need something at each end that will hold it up, you don't want it to be too heavy or else you may aswell take a tent, you need something to create outward pressure to counter the pressure of your weight pulling the ends of the hammock inward and you need to make sure that the whole setup is not going to topple over sideways.

I need to say now that I have not tried this but for a long time have been going over different scenarios and soloutions in my head, like how to hang a hammock from one tree or in an abandoned building and hanging without trees is one that has been widely discussed in the past. The general consensus would be that tarp poles are the way forward.

Based on that and keeping the light weight need in mind, I'm going to suggest using a pair of Tatonka 180cm tarp poles, Paulie showed me a pair recently and the are strong, light and when apart in sections, sit inside themselves and pack down to about half a meter in length. They would have to be placed on a pad of some sort to prevent them pushing into soft ground as the pressure on them will have to be almost directly downwards. Using a hammock with a structural ridgeline, tie each end of the hammock to the top of each pole, then tie two whoopie slings or strong guy lines to the top of each pole, stand everything up and using some big strong anchor pegs, peg out the slings at 90 degrees to each other, both being at 45 degrees off the line of the centre line and as far back as you can get them from the pole. Place the other pole so that when the centre line is taught it and the first pole are both virtical and guy out the slings on the other end in the same way as the first. Tension everything off as much as possible and make sure that the anchors are solid and not going to come away.

Now the idea is that the ridgeline prevents the pressure from the guy slings from pulling the poles over and creates a rigid structure, using a hammock without a ridgeline would mean that you would have to put the hammock under tension to prevent the poles being pulled outward and then you wouldn't be able to get in it. Hopefully now you will have a rigid structure with the hammock sitting fairly comfortable beneath and of you're really lucky it will be able to hold your weight.

I hope this is going to be helpful to someone, and if anyone feels like trying it before I get a chance, let us know how you get on.