Option 1 -- pull this unit off the frame as a unit and build the other one on the frame then swap out he stove.
Option 2 -- Take it completely apart and then fab the parts and re-assemble them.
I kind of like the idea of keeping this one together and getting a new body together and then just swapping them out.

Thee is too much rot to keep the sides / top / or floor, and the green in the galley has GOT-TO-GO!!!

So What do you think you would do?