MYOG: tyvek ground cover / bivy combo

John at BPWD has some that is 106" i believe

just to add another choice zpacks and shipping is $3.95.

john, i would love to see the dimensions on your tent, and possibly the dimensions for the geometric pattern which resulted in your tent. i am trying to do one similar and since im severely math challenged, i need some help.

im trying to create one similar but i want to start with a footprint that is 60" wide at the head end, 50" wide at the foot end, and 84" long. i used pythagorian theorum to determine the length of the sides, but now i cant figure out how to determine the sizes for the other 4 panels, because i dont know how to calculate sides of a non right triangle.