Lots of diy info here on hammock forums..look under the diy forum and tutorial forum, many options available. If its been done with a hammock, its somewhere on this site.
Just Jeff's site http://www.tothewoods.net/
is loaded with great info and tutorial info, he is a member here, and a cool guy.
Should be all the info you need, fabric choices, thread, needles, measurements, etc. Do some research on these two sites. Make your choices on what style and size and get busy.
Be sure to browse thru the video forum here on HF, lots of useful info to be learned by watching them. Grizzly Adams video series on suspensions is a must see, and Shug's videos explain pretty much everything else. And they are both entertaining. (or at least try to be