Partial Floor Replacement and Wall Access

[Jamespio]

My 69 Ovelrander arrived with the last two feet of the bathroom floor removed. This is a rear bath unit, so it's the last two feet of the trailer. PO gutted 1/3 fo the bathroom. He Took out all of the bathroom halfway u pthe walls, but left almost all of hte plumbing, and all the electrical that occupies the service center. I've repaired the frame (obviously the same moisture that rotted the floor got to the frame). I'm almost ready to put in a new subfloor, but I've got one problem.

I don't have access to the C-channel. The bathroom is removed(at least the bottom half) but the interior skin is still in place, and I can only remove it by removing the rest of the bathroom, and most of the plumbing. So getting inside the walls to install new bolts is going to triple the work I have to do, going from repairing and reassembling a bathroom, to finishign the gutting and totally replumbing and rebuilding the bathroom. As it stands I have access to the section of c-channel directly below the service center door (approx 1/3 of the c-channel that needs reattached to new floor), and I have access to the bottom of the c-channel (I've removed banana wraps and dropped the rear of the belly pan).

So these are all options that I have brainstormed and need some input on whether any of them will work?

(1) Is there a way to screw my floor to the c-channel from below? Some self-tapping screw, maybe?

(2) Is there an alternative to bolting it, such as an adhesive that would actually be adequate (this strikes me as a true longshot)?

(3) COuld I use a piece of angle (many, actually, cut short so they'd fit the curve of the sides) to join the floor to the c-channel by riveting or screwing (again with self-tapping screws) through the angle, the inner skin and into the c-channel?

(4) Other options I've not thought of?

(5) I'm out of luck and need to finish gutting the bathroom in order to do the repairs properly?

[cwf]

Pictures?