Have you seen our SketchUp for Professionals course? https://sketchupforprofessionals.com/sufp-sign-up/
This course is a little outdated, but still very relevant. I walk you through building a master suite.
Keep an eye out for the re-launch. I have been working on the new course for the last year and I just know it is exactly what you are looking for. Just need another month to finish it up!