I'm of no help with designs. I'd love to join you but the 12+ hour drive is a big deterrant. Good luck and get some pics once you get started.
If you want something truly portable have you considered these?
http://www.cabelas.com/fryprod-0/pro...5694.uts.shtml
For $129, it is elevated and covered.
If you need a two man they get pricy...
$680
http://www.directoutdoorproducts.com...-S00_all.shtml
$709
http://www.gandermountain.com/modper...1&merchID=4006
$729
http://www.gandermountain.com/modper...6&merchID=4006
Or you could put your own blind on this platform for $299, but its only 60" x 60"
http://www.gandermountain.com/modper...6&merchID=4006