Would you consider building a closet that would hold the platform on which your mattress would be placed? The outer side of the platform could have drawers or doors to the storage units under the platform. This kind of enclosure would work better for a twin bed than for a double, but it would provide a place where the bed can be concealed during the day time. Then, if you could allow a path between the bed enclosure and sofa, you could have the sofa face the dining table, or you could place the dining table at a right angle to the end of the sofa.

The recommended fit around a DR table is 24" larger on all sides for the chairs. You won't have that on the 6'8" side. I'm thinking the rug is going to be too small for the room 8x10 or even 9x12 would have been a better choice.

you should take place your dinning table near to the all by which u can get a lot of space to decorate these place much more beautifully.

no matter fan is far away from dining just add little bit extra rod to give it fall from ceiling from dining top 4' gap is enough for ceiling drop lights you can get these online or ikea hope it helps