GROUND AND HAMMOCK Tarp help!

I have a local supply of tyvek and am hoping to make a 4 season tarp for ground and hammock use.
Im hoping to make it with doors so I can close it in, I would like it to be lower and wider than a conventional tarp when pitched with doors closed.
1) I am hoping to get help with dimensions/ get a template so i can figure out how much I need.
2) Any suggestions on making tie outs?
All help is appreciated!
Im hoping to make it with doors so I can close it in, I would like it to be lower and wider than a conventional tarp when pitched with doors closed.
1) I am hoping to get help with dimensions/ get a template so i can figure out how much I need.
2) Any suggestions on making tie outs?
All help is appreciated!