Agfadoc...I wondered about drainage on the shelf. I thought you might wrap the tripods like a tipi for waterproof storage.
G...Hawk...use the common tripod for the foot end of both hammocks as the head end tends to carry more weight. I would caution you to inspect the bolts before/after each hang (should be doing that anyway). I don't think you'll have any problems, but it's the bolts I'd watch.