Got back from family adventures involving lakes, trails, state park rangers, and the headwaters of the Mississippi. Had a nap in v0.1, brought a yardstick. Some relevant measurements
webbing to webbing at the midsection : 22"
webbing at midsection down more or less straight to hips (before the body bends the fabric around : 14"
webbing at shoulder down more or less straight to shoulder blades (before the body bends the fabric around : 19".
These will be useful in making more precise compression estimates, just thought I'd get them recorded.
I took out the spreader bars, make sure there was a rescue team standing by, and got into the hammock. Now the gap between webbing at the center is 14". I was able with one arm to push out the side to 21". So there wouldn't be any problem pulling the side out at the center with stakes, with or without lowered spreader bars.
Having the spreader bar lowered by 12" makes for very little headroom. I'll want to rethink the placement of that.