I think if you were trying to make a HAAB/ENO clone, by using three panels of fabric, you could use a flat felled seam to join th panels together.
I would like to find that fabric that they use. In my talks with Ticket To The Moon hammocks I tried to get them to sell me some of the fabric.I asked a few times but they never addressed selling me the fabric in the replies. I took that as a subtle way of telling me that the fabric was not for sale by itself, at least from them.
“Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it."