I'm sitting here looking at an el cheapo hammock and the thought occurred to me that I could do some experimenting with it. Specifically, I was thinking of trying to add an UQ modification to it.
My thought was that one could sew webbing straps with adjustable buckles on the outside along the hem, to hold a foam pad or UQ in place. I wouldn't have to mess around with doing anything radical in the hammock body at all. I'd simply be using the outside hem.
If one didn't need the UQ (in Summer, say), you could remove the webbing between the buckles. The modification would be light, depending upon how excessive you get adding buckles.