Her version isn't meant to be a groundsheet. I didn't ask specifically why she put the sil on the bottom, but I'd guess it's just better protection in case the bottom scrapes the ground - sil won't pick up mud and debris like bug net will, and won't snag on twigs and rip as easily.
Maybe a small string to tie around the very ends if you're REALLY worried about bugs getting in...ants crawling down the supports, maybe. Not sure that's necessary, though.
You could also run a small cord from the tarp tie-out to the bug net so you can pull the bug net away from the hammock. That would give you enough room to sit up inside the hammock. Otherwise, the net will probably lean against your head/neck if you're sitting sideways like a lounger. My HammockSock does, anyway...it's ok (and not much more) if I sit straight up Indian-style, but the material touches me if I'm lounging sideways.
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