Thanks, in fact I remember that one from a few years back. I think the edge taping would be the most tedious part.
I made a tyvek tarp that I actually used a couple of times when I was a ground dweller. I now hammock and it's not nearly long enough for that. Never got to use it in really nasty weather like gales+heavy rain, but it did okay with some spiffy 20mph breezes.
I used some pieces of bamboo chopsticks and duct tape for the guy line and ridge line attachment points. Worked quite well.
However, this tarp is still heavier than a comparably-sized .51 DCF (Sorry, don't have exact weight...)
tyvek tarp 01-small.jpg