Tis so true. We had a water leak under the refrigerator and had to find out the hard way the molding was all screwed in from behind as they make everything in modules outside. That makes working on things so difficult and unlike in a house
We also had to deal with Thor no longer having the matching color woodwork replacement parts for our 2015 Challenger. They said go find a wood worker.
They billed this Challenger as a full timers home but that was a false sales pitch. The infamous magnet test for a steal plate behind every screw also proved to be false for us.
We got the W&D hook up and had to remove the units for repair and parts replacement which also was a hardship for the above reasons. They clearly did not make the RV convenient for DIY repairs.
Here is another look at the cabinet above our microwave and I have to assume it too is screwed in from behind so finding the screws holding the Microwave is a DIY nightmare and or costly service bill it seems. the screws as you said might be under a false bottom?
2015 Thor Challenger