To me tarps are pieces of fabric that I use to keep me dry whn I am sleeping in my hammock, or during a rest stop in the rain.
If there are walls and zippers, then it's a tent. I have never understood all those tarp tents being called tarps... but that's just me...
Hammocks, I have many, all home made. and I used them with no-seeum if I will be in buggy places, never have had a problem then....
My tarps + hammock + guy lines + no-seeum is light, and I have stayed dry in downpours where every single ten in the campsite were flooded, like the ground could not absorb the water and it got higher and higher, higher than the waterproof strip on the tent floors.. causing water to rush in.... I was hanging over a puddle 50 sq feet in size and about 6 inches deep... stayed dry the entire time....
I have had the misfortune of being stuck in a spot with only one tree and 3 days solid rain, just slept on the ground and the tarp kept me dry....
Robi