This thread is Head-Fi's truly well hidden gem. Just read those all 36 pages with much interest and awe, within a period of 3 hours or so. You guys give a whole new dimension to this hobby. To think that someone can so easily build something that compares to the $5k 009 with such inexpensive materials is quite staggering. I hope you guys allow others to have a taste of your creations in future meets. It would be a real shame if the only people allowed to experience such fine fruits of labor be those who built them.
Anyways, here's an idea for your future creations. Regarding the issue of sweat/vapor guard (even though you guys seem to have it mostly solved), take a look at this neat product:
Spray this on a thin fabric (perhaps pantyhose) then use that as your guard. It should repel moisture far better than the mylar film, while being air-permeable!
Mr. Chinsettawong, kudos to you, Sir, for being the pioneer, as well as being so willing to share your knowledge and experience.