If you are buying new the CCC should be on the company web site or in brochure. If buying used, I personally used the RVCG compilation list that told CCC for basically every used motorhome made. Or you can ask on specific Mhomes on this forum and pretty quick someone will know.
Size of storage area is something people don't talk much about in my experience. What is important is full width storage compartments and slide out trays. At least one full width storage area is needed or at least very nice to have.
Floor plan is pretty personal. We really liked ours because it was a south west theme. High quality leather upholstery, solid counter tops, a large hanging clothes storage area. We also wanted the front room and the back room of the coach to be pleasant to occupy so we could get a little space between my wife and I.