Hello Michael,
Welcome to Permies...
I won't get into any great details as this question was addressed to Erica, but I can share that given the correct design an interstitial wall
RMH should be achievable. I am not sure from an ergonomic and design perspective it would be more functional, easier to build or applicable than a built in furniture piece or sub floor variatie...it will all depend on the design...
Good luck with your plans,
j