Howdy and welcome to airforums.com, GaCamper!
Lots of folks on here that can answer your questions, but some like me will just add to them:
- You will need to consider moving windows, too
- Add to that the outside doors to the storage areas will need re-sorting
You will find that what you are proposing to do is quite a big job. You might want to concern yourself with just getting it roadworthy, or selling it as is to buy one with the floor plan you would like...
In any event, good luck, and keep asking your questions!