If you sleep pretty warm you *might* do mid to low 40s with the right clothing layers but I'd definitely do some backyard testing before your Smokies trip to find out how well it works for you. Weather can be pretty temperamental in the Smokies in the spring...would hate to see you get caught short.
For the bugnet...here's a link to a blog post I made last summer about one I built that's pretty similar and costs less than $20. There are links to Fronkey's video and one from another fella.
http://getoutga.wordpress.com/2013/0...eat-the-skeet/
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