It looks like you have done a good job of maximizing the usable space. Before building, you might lay it out with paper forms on the floor. My wife does this whenever she decides we need to move the furniture. It's a lot easier to move or change sheets of paper than cabinets or couches.
Good idea. A roll of butcher paper should do.
"Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."