I appreciate everyone’s input and advice, which is what I was looking for in joining this forum. This gives me a lot to think about.
After reading through all the comments I am leaning towards using a pine tongue and groove “car siding” instead of the walnut and staining to match the woodwork of in the rest of the house. I can use the walnut for other projects.
I still want to do the wood ceiling as this was the original design back when we started the project. With a 100 year old house we want to capture that time era design with a modern flair.
Here is a picture of the bathroom with white subway and white hexagon tile floor. The top part of the walls will be white shiplap that I am planning to make after finishing the ceiling. There will be a wood ledge on top of the neil walls that will match the color of the ceiling.
I will definitely be sure to seal whichever wood I go with to help stretch out time before having to fix any of the wood ceiling issues that will eventually come around.
Again I appreciate everyone’s input.