Need advice on repairing softspots in floor

I've got a 2005 palimino stampede. Bought it from close friend that fell on hard times a while ago, unfortunately the camper was neglected during this time. I have soft spots in the floor and from my understanding this is considered an ultralight trailer so it's sandwich material. I'm addressing a few suspect areas relaxing weatherstripping around the entry door etc. So here's where I'd like some direction. I'm thinking of pulling up the linoleum and letting it dry out. Use git rot on areas of concern kill any mold and recover with a floating floor like laminate after I can assure no future damage from existing problems. From what I've read this floor is basically pre-assembled, has aluminum supports and laid directly on the frame runner. Does the walls overlap the floor or if I cut out a rotted area how do I go about repairing underwater damage. It'd be easier if I just had to wreck to the wall but my ocd would get the best of me.