That's a very good one to read for shell off! He's a brave man to raise a 31 footer!
We were more chicken, and did our's shell-on. Here's the link
http://www.airforums.com/forums/f185...urb-50967.html
Everything is riveted so it's a matter of drilling out rivets to release. You will need to take the lower inner skins off to access the C channel to get the bolts and screws that hold the sandwich of the frame, floor, and C channel/trailer walls together. Some people have left the belly pan in place to do this, but we did remove ours (warning - not a fun job).
If you run into problems or questions - post pictures and ask! There's lots of help on the forums, and lots of us doing what you're doing in various stages. Feel free to PM us also!
Good Luck!
Kay