Floor Repair on TrailLite Camper, grrrrrrr.

It's time to fix the floor in my Bantam Trail Lite Hybrid.  Soft spot in front of the fridge.  Based on my internet research, the floor has a very few metal beams, and is mostly made of styrofoam sandwiched between an aluminum underbelly and a Luan top piece.  This will be tricky to repair.  I've seen several solutions, and none are satisfactory.  I'll take photos when I get to that point.

I considered just patching it up a bit, or flooring over it, but I'd know that wasn't right. I don't mind doing a mod to a design, but not something that just puts off the problem. I learned that with the PopUp. I kept trying to patch the lift system. I finally bought all new parts, installed them, and never had another problem.