There are a couple options to consider when looking at hammocks, the main ones are either a bridge or gathered end style.
This is the gathered end that I designed, with "saddlebags"and bugnet. I sewed up the tarp from Silpoly and made the "Under" and "Top" quilts ... this is in Porch mode and is good to -20C (-4F)
https://lh3.googleusercontent.com/p...GqxPyERSWpaOOIdbU5o=w1500-h1125-no?authuser=0
This is the Bridge I designed with basically the same setup, custom, full shelter tarp, and quilts that go to -20C (-4F) and a second set of quilts for -5C
If you use a tent there are things you need besides the tent, like a pad, a sleeping bag etc., it isn't just the tent weight, it's the weight of the entire sleep system and the volume it takes up in your pack. Those quilts all use 850 down and pack up very small and are incredibly light .... but like i said before, as a sleep system, I think that a lot depends on what you think you need and what you will find comfortable.
The hammock movement is likely a lot bigger than some people realize, in the groups I camp with .... ground dwellers are rare. Like I posted, visit the HF site, data mine the posts a bit, you will find more information and possibilities than you likely realized existed.
Brian