Afraid I'm not very helpful when it comes to Dynasty building. The emphasis on game function and dynasty strategy are a little foreign to me, so I'm not sure how much help I could be. I do know, however, that while the discrete bedrooms seems sensible, it would be more cost effective for your rooms to be adjoined. This way, they share a wall, which reduces the number of necessary wall pieces.
consider that for your next renovation. you might also want to consider creating another save file for side building projects. that way when it comes time for the ultimate renovation, you'll be comfortable enough with the building tools to build a brilliant dynasty mansion.