My name is Alberto and i live in São Paulo/Brazil. Im a trekker too and a user of hammocks. My english isn't the better, but i'll try my best.
Im findind difficult to do my hammock's tarp. I don't know there, but here we use the hammocks at 45 degres, don't equal there, that you stay in hammocks with the head and the foots pointed to the trees. The body stay firm, don't like a "banana".
So, i need to do a tarp with hexagonal or octagonal form, to cover my head and my foots. It needs to have in minimum 3,3 meters of length and 2,58 of width. It needs too have 14,1096oz/400g (the maximun weight).

How i do this?