my scale drawing in sketchup. we have 39' forward the intake "box" at the rear of the coach. theres a queen, then a wall with pocket door. then 4x bunks with a "narrow twin XL" mattress. another wall with pocket door. then a 34x48" shower with a 12" closet for towel storage, vanity and toilet on other side. door. then kitchen. depending on our cabinet choices it should leave us with roughly 12'x8' forward for living area. plus maybe 20" if we turn the queen bed sideways.
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I would swap the location of the bunks and bathroom. That will separate the main bedroom from the bunks with a bathroom and make both places feel more private. Having the bunks right next to the main bedroom will make it feel like you are in one big room. And every time you need to go to the bathroom at night you don't have to walk past 4 sleeping people and wake them up with lights or worse stepping on toys in the dark (ask me how I know).