Do you have upholstery you need to worry about, or are you starting from scratch and getting new? Nomadic Desert is one of those warm neutrals that will go with any color, and IMO, it doesn't make any difference if it's warm or cool. My sister recently painted her family room a color close to the ND, and did an accent wall in a rust color~ it looks great, and very cozy.

I find it easier to find fabric I love and only then pick a paint color. If you find the perfect fabric or rug, you can repaint. It’s only a gallon or two of paint and a weekend to change paint. Even a custom paint is only $ 50.

My trim and ceilings are SW Pure white. I have stained wood lowers and SW Pure white uppers. My walls are a very light gray though so that gives a bit more depth (Drift of Mist). In your case I would probably use SW alabaster on the cabinets as well unless you want the cabinets to look WHITE and the walls and trim to look creamy/slightly yellow. Personally I don't think I'd like the contrast.

I think that painting the ceiling planks white is perfect for your beachhouse, it just needs to be accessorized correctly so that it doesn't look too white and gray (see illustrations below). For the walls, I suggest a light greige, BM Balboa Mist, that mixes well with white, gray, and wood. Or a neutral gray such as BM Gray Owl. Any paint you choose I highly recomment that you paint a large cardboard (available at Dollar stores) with 2 coats of paint (samples available at paint stores) and walk around the room to see the colour in different lights. For your corner fireplace, it looks like something black on the floor under the fireplace, not sure what it is but I would do a black porcelain tile under and on the sides of the base. You can also replace the spotlight on the ceiling by a more modern black one, Amazon has nice ones around $40. Have fun with your project!