,The Clark NA will keep you warm, and if you're in hot weather you can turn yourself around and lay down so your legs are over the pockets thus helping you regulate your temperature.
I believe you can set up the Clark on the ground (atop a tarp) with a couple of supports for the fly to keep out the crawlys. If that's not a concern I may just use the tarp. I've also seen pics of any hammock hung between boulders.
The NA is sized for people up to 6'5" and 250lbs, I believe. I'm right at the line and I'm comfortable in the NA, I did however opt for the larger (xl) fly, however I haven't been out in the rain with mine yet.
Tree straps are earth friendly, if you can sew, you can grab tow webbing or even hit a junkyard and pirate some old seatbelt webbing and make them yourself. All The Clarks have instructions on tying the boline, and the square not is a mild variation on your 'tennis shoe knot.' Both of those are worth knowing for everyday use.
Lastly, the driprings were sent with my hammock.
I sleep in the trees.