Thanks guys. Very much appreciated. I seem to have the general idea - been hashing the numbers around for a bit. Initially I wasn't even planning to include the tarp on the line - I tend to enjoy pulling up my hammock and clipping it to the tarp ridgeline to give me more room under the tarp to bang around especially when raining.
But I also want to keep my options open - especially for any beginners I take out who can do with a great and simple system to try.
The instructions would be great to compare against but in the end I may take your measurements as a start and just experiment away and see what happens.
The key to immortality is first living a life worth remembering. - St. Augustine
Some people feel the rain. Others just get wet.
- Bob Marley