It looks good and seems to fit your right. Congrats.
Yes, one layer would hold you. One layer of 1.5 holds my once 305 now 275 pound rear for 8 months now. Then again, that's my inside use only hammock, you may want a little more insurance out in the pricklies.
A little more sag sir and I think you got it. And pillows. One for your head one for your knees. Sleeping at home I like to add another king size to hold or push down by my feet if it's hot. I'm a hugger but it also acts as kind of a short over quilt. When it gets cool enough in my room (50-60) the pillow won't cut it and I put an insulated blanket over me. I sleep out in the field with less, clothes under the legs and a little pillow for the head, but at home, might as well be comfortable.
Oh so comfortable.
Well done sir.
From Somewhere near Parkville, Mo
Everything you need to know about Hammocks in vids and reading:
Hammock in 3 minutes D. Hansen - It really is this easy to make a hammock
Shug's Hammock Newbies videos - Takes you buy the hand and shows you in video
The Ultimate Hang D. Hansen - now read about everything
JustJeff's Hammock tutorial - more reference
TableclothFactoryBlanks - shorter lengths available on sidebar
The TurtleDog Stand thread - Hang anywhere.
A nice, easy project.
Experience is the worst teacher - it presents the exam first and the lesson later. - Unknown