the best suggestion would be to contact a design professional or a cabinet company to assist you, as a project of this nature could take hours to design and refine and then the production time for the design needs to be over seen by a knowledgable person good luck....this is a for pay type of design issue

Are you looking for a room divider? [houzz=] [houzz=] [houzz=]

Maybe walls and drop ceiling could be painted in a vibrant accent color instead of more beige. Stripes are usually formal, more casual if not the same size. Chic could be achieved with silver and beige stripes - wide and horizontal. Here is an idea book on stripes and one on how to DIY. https://www.houzz.com/magazine/the-case-for-striped-walls-stsetivw-vs~225887 https://www.houzz.com/magazine/how-to-paint-perfect-wall-stripes-stsetivw-vs~3427677

For the dining room, I think I'd orient the table 90 degrees from how it's drawn, and I would make it a drop leaf or gateleg table so that it can be made smaller when not being used for dining. I would embrace the idea that the entry is right in the middle of the living room, and bring the living room furniture out towards the fireplace so the fireplace is connected to the seating area. Maybe TV above fireplace. In that back corner where the sofa is drawn, I'd make that a small work/office space.