TechWriter,
That WAS a series of unfortunate events, for sure.
I think that's an AWESOME game plan. I've always liked the look of RV's with a mural on the back. Something your wife creates makes it so much more special! So tell me, are you going to have her paint the grill so it looks like a DP too? ;)
While it's probably not necessary, I would recommend that you use marine grade plywood behind the fiberglass. It adds a bit to the price but you won't have to worry about water that splashes up on it from underneath the vehicle degrading the plywood.
PLEASE keep us up to date on the repair. I'm really interested in seeing how this turns out for you.
~Rick