Unfortunately, not much new to contribute here. My tab is from a link posted by Teleplayer324 in the easy song database forum.
http://www.fretplay.com/tabs/s/soggy_bo ... -tab.shtml
There is a powertab version out there but I can't tell if it's in DADGAD or not. (Appears not)
The guy who wrote the tab at the above link is right. It just doesn't sound the same unless you use DADGAD. It also makes the fingering very simple.
Keep in mind I'm only a beginner, so what sounds good for me probably doesn't cut it with most of you guys, but what I do is take the chords, vary my rhythm, and do a lot of partial chord strumming or the bottom 4 or 5 strings. This gets me something that approximates the harder driving, strummier track 5 on the "O Brother" album vs. the more delicate band version.
The above tab does include Travis-style picking for those of you who can do it well. It's well worth a try...
The Treetop Flyer link is what I have. I was just curious to see how the transitions between the chords worked in Travis-style picking in DADGAD for this song. It's a bit beyond my ability at this point, but it would be a great challenge to see how far I could get. Besides, everyone needs one song that nobody else can play. Not too many "Treetop Flyer's" out here because of the weird tuning.