The one that Mors has the skeeter net at 14" x 26" wide.
Also you just make the side opening large anuff to crawl in between the layers
for bug protection.
Slipe a pad in for insulation.
When Stuart of Adventure Ltd makes he's and uses in he's courses for jungle survail in Borno he adds the sleeve as you have and as a Tai hammock and just uses a double layer of para cord wraped once around the tree and tied with a bow knot.
Theres ties , stake loups in the four corners.
When used as litter as you discriped make sure the pole is at least long anuff so you can have two people on each end or four porters.
Litter bearing is rely hard work !!!