Switchback style bugnet...
...is the same size as the hammock. That is why you see the gathered effect in pictures of it and why the spreader bars work. I actually made a similar one using walmart sheer curtain material for the netting. It is very strong but not quite as breathable. Didn't even use full length zippers both sides. It is also like the Hammock Bliss Noseeum No More. When I don't need the net I just sleep on top of it as a double layer. Or, flip it over. See this vid...
http://www.youtube.com/watch?v=NExUyaEz8cA
I didn't make mine quite that long. And SB is about 52 inches wide, HB is 60 inches wide. I compromised at about 54 inches. I had a HB and didn't like it because the fabric has quite a bit of stretch as Sgt. Rock says. Otherwise I love the versatility. That is why I chose that design for this DIY.