I can't believe I've just checked gnet after all of this time, but procrastination calls. I'm a couple of months late to this thread as well - maybe someone will be interested though.
The stuff posted here reminds me of some psychobilly bands and some neofolk bands. Silliness abounds in the former though.
My favourite neofolk is Rome (although not Americana), especially the album "Masse Mensch Material" (see first link):
https://www.youtube.com/watch?v=t28uRNDOaQQ
https://www.youtube.com/watch?v=b1qyFumRl7M
Or there's this band:
https://www.youtube.com/watch?v=0USSHqur1Qg
Or some psychobilly (might know these guys already):
https://www.youtube.com/watch?v=falKiwrMKQc
https://www.youtube.com/watch?v=KbODVOMDOew