well scratch my eyebolt idea, unless you weld them up. As is, they have a very low working load rating. These smallish ones, 1/4"-20 threaded rod are only rated at 100-lbs. The next size up was less than 200 IIRC. These quick links are rated at 800-lbs.
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Direct solution is a ring bolt, or a lifting eye bolt, or a scaffolding bolt. All have solid rings and much higher load ratings.
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I figure a squarish trapezoid shape, roughly 4' across and 3' deep, with straps spaced every 6" and straps at the corners for buckles, comes to about 65' of 1" strapping. That's less than $30 from Ripstopbytheroll. The pictured hardware above was about $6. Call it $50-60 in materials for the whole thing. Can tape up the layout on my work table, the perimeter strap. Then cut and layout the cross hatching pieces. basket-weave / interleave the pieces. Then a dab of hot glue to tack things together, then a thorough sewing job on each intersection. Would be a little tedious but a straightforward project (see my awning project below).
or a person could readily weave one as demonstrated above, using true 550 paracord, available in a variety of colors. Beware the commercially available lookalike product which has nowhere near the load rating of 550 (which is called that because it's breaking point is 550-lbs).
A 4'x3' net with a 6" spacing is roughly 60'. A 3" spacing a little under 120'. A 2" spacing, call it ~160'. And would still weigh under ONE pound.
1000' spool is $55 -
http://www.paracordstore.com/Bulk-550-Paracord-Spools_c_13.html
I'm looking around for 1/2" flat webbing for the 'field' of the net, but I can't find any break-rating claims. So it looks like the choices are rugged 1" black mega-net, or subdued interior color matching paracord and having something about as effective but much less noticeable.