Here is my initial floor plan. Looking for feedback. I’m 6’3” 245 lb and my gf is a modelesque 5’11”. This plan started with a queen mattress oriented in the passenger side rear corner. Plan would have electrical system over 1 wheel well, water system over the other. I’m thinking about building the shower with a prefab pan, kerdi board walls covered in frp. Shower would bilge into grey tanks under the sink.