OK...well, it's a crisis for me, anyway.
This is for you great shell-off folk.
I'm removing the shell.
Glad I waited till it's 90 degrees here every day.
That way it's a good 110 in the trailer, where I'm working.
Comfy.
Anyway, here's where I am:

Front and rear wood floor: nonexistent (rot).

All rivets out around exterior waistline and a couple of rivets up from there where the endcaps meet the sides. (This does not include the rivets that hold the bellypan to the U-channel, since their heads are beneath the upper outer skin, and are relatively inaccessible.) I did remove the sneaky rivets in the side skin, tucked under the front and rear endcap corners.

All bolts in U-channel removed. Used grinder, Dremel, Rotozip, boltcutters, and air chisel. Finally got them all out. I didn't remove the ones in those little steel brackets yet, but they don't seem to attch to anything but the plywood floor.

Bracing is in place. 2x6's in the front, in the middle, and in the rear; additional braces and some to brace the braces. They're exactly 5 1/2" off the floor - so they have rested on a 2x6 on edge.

I guess I didn't mention- interior skin (lower strip) removed, all the way around. Insulation out from there.
So here's the problem:

I'm jacking, and it doesn't seem to be going anywhere!
Well, I started in the front. Hydraulic floor jack fits nicely under the brace (in the center). As I jack, I can hear a little creaking here and there....and, in fact, although I can't see any lifting occurring (the rivet holes through the perimeter still line up-I can still see light), I have been able to "chock" it an inch higher. That is, the brace is, after jacking, now 6 1/2 inches from the floor (it was 5 1/2 earlier).
I then moved to the center brace; it, too, will elevate a tad, but not too much.
I haven't moved to the rear just yet.
I wanted to shoot this email out first.

Am I missing something else that holds it together?

Are there other hidden rivets or the like that I need to remove?

Am I correct in thinking that the shell (outer, upper walls) and the ribs should be the only things going up?

Is there even a need to have removed the bolts around the perimeter, since the U-channel will remain on the floor until after the shell is lifted and the rivets for the bellypan are removed?
I just don't want to use too much force and screw anything up (Ha! Like I haven't already!)
Anyone?
Anyone?
Feel free to PM me...in fact, anyone with experience, PLEASE PM ME!
Thanks!
-Chuck