Welcome to the cult Will. A couple comments. The floor doesn't look that bad to me. If it's not THAT soft, pour epoxy in the soft spots and roll on for another 40 years. It's it's rotten through, you can still patch with epoxy and new wood. It's a 40 year old motorhome. I expect most of ours have had leaks over the years and have rot or soft spots that we don't even know about.

Regarding cabinets, I hate particle board. It will turn to dirt from humidity alone. I tried rebuilding our overhead cabinets and spent a month and too much money trying to save them. After all that, they LOOKED good but every time you opened them, it would rain dust down on the lower cabinets. I gave up and made new ones. I was in the process of working my way through the bottom cabinets and the hall modules when we decided to sell our coach. It would not be difficult to make new structure and doors.