Wall repair

Ok, this isn't a remodeling thread...yet.

I noticed some swelling of the wall panel in my 92 fleetwood just below one of the rear side windows on my most recent trip. This weekend, I removed and resealed the window and did what I'll call a temporary repair to the wall. I hope to make a better repair in the winter when I have more time.

For now, I used a razor to cut out the wallpaper and top layer of  plywood (luan maybe?) and removed it in one piece. It was fairly rippled, so, I tried ironing it with some steam and then pressing it overnight. That flattened it quite a bit, but it was a bit larger when all was said and done.

The next layer was very buckled and delaminated, so I cut that out, though it pretty much fell part in its own.

I treated everything with some epoxy sealer.

There was a small void in the wall foam under the corner of the window that I filled with some expanding insulation foam and trimmed flat.

I then took a piece of 1/16" thick veneer and made a patch to fill the void left by the layer of plywood that I removed and glued that in place.
Then I glued the outer layer back in.

All was great until the veneer began to swell, probably from the moisture in the glue. I didn't  leave any clearance for expansion of my patch, so it buckled a bit, though I don't think you can tell in the photo. But, it still looks better than it did, and it is solid. I also put some butyl flashing tape over the exposed wall edge before reinstalling the window (along with new butyl caulking and some silicon along the top ee and Dow part of the sides). There was something similar on there but it wasn't in great shape.

I'd like to just redo all the walls in the rear bedroom area. Seems like the easiest approach is to just add another layer on top of what I have.  I've read posts where people have removed the interior panel, but that seems risky.  My thought is to make a template so I don't have to remove the cabinets, cut some paneling to fit, pull the interior window trim, glue up the panel, and reinstall the window trim.  Sound about right?
Any gotchas or opportunities Inshould be aware of?

Thanks

Hi, its better if you just attach the images so that we dont have to download anything. 

I think he did try to "attach the images", but they aren't there (size is 0 bytes).  Maybe they were too large or otherwise not accepted by the forum software?

Reposting pics...

Sometimes when the wall swells it means that the insulation has gotten wet and has fallen down inside the wall and is pushing outward making it swell.  I have a small place like that under a window that leaked but i have not yet cut into the wall yet. I suspect ill have to replace the insulation and treat the mold that may exist.

Did you find any wet insulation that was making it swell, or was it just the wall board that was warped?

Discovered wall issue behind passenger window next to seat belt bracket. Thanks to poor work by dick gore clowns installing new awning. Did not seal top awning bracket screws! Leaked inside wall ruining insulation, luan and wallpaper. Good luck trying to find RV wallpaper. Camping world said only way to get it is to buy whole sheet of luan With wallpaper attached from 4 winds- Thor. Not going to happen. Woodworking friend is going to make curtain holding shelf and document, maps and atlas holder to cover area. Will cut out bad, install new insulation and cover with new gizmo.