Hey Convertee - Great to see more Mainers here at HF. I'm in Glenburn, next town over.
What you're talking about is very possible. You could use either zipper or velcro, doesn't really matter. I made one similar to what you mentioned, with velcro at the either end for a couple feet, and left the center unfastened. I made it a bit wider at center and added pockets to put some gear or a stick/trail rock in to keep the flaps down. Works great and it's totally removable - not that you want to be w/o a bugnet in Maine!
Here's an illustration of what I mean. You'd have to change dimensions a bit to fit your hammock, and desired ridgeline length.
Bugnet System.jpg
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