Richard, this concept of rigging a tarp between the "4 piece paddle segments...............packraft centric system" - do you mean that are you using the paddle in 2 sections as a ridgeline for a tarp, or are you using a central guy rope on the tarp pulled vertically, and the 4 separate sections of paddle on the corners to hold the tarp corners higher off the ground, centred on the packraft. With any of the setups, we normally carry a 9' x 11' tarp anyway, as it often enough pisses with rain for 24hrs in NZ, and having some cover to stand under/store stuff under is pure luxury, and I wouldn't be without it.
How much does a mozzie net weigh - I thought that they were about 500g, and my rationalisation for thinking about hammocks was that sleeping on a packraft required a normal sleeping bag (mine is 950g), and a mozzie net (500g), and then fitting 2 of us under the tarp, whereas a Hennessy ultralight hammock was 850g, with own tarp, and, as the hammock tends to hug you, I reckon I'd get away with a 300-400g home made quilt, rather than a sleeping bag, plus you wouldn't then need to be under the main tarp when sleeping, so would have plenty of covered area when it rained.
We're summer camping, so the underground insulation is not so important, and we do use the wine bladder from my home made PFD (300g) for pillows. Maybe the hammock/smaller quilt vs raft/mozzie net/sleeping bag setup turns out a similar weight............in which case I suppose it comes down to the terrain you're sleeping in. It would seem that both are lighter than a tent.
At my age (48), I'm not into having a miserable uncomfortable time, but also wish to limit what I carry, so I'm after the best compromise.