Hi. The room looks lovely. I'm not convinced you can fit seating for that many. Personally I'd swap 2 of the dining chairs against the wall for a banquette seat so you have additional comfy seating. I have attached a link to a company I found if you like that idea as they're not easy to find! I'd then have a small sofa where the cage is with an upholstered footstool in front of the burner. You may be able to angle a chair opposite the sofa, hard to tell if there's room. I would mark any seating out with masking tape or boxes as you don't want to overcrowd the space. Do add a rug to zone the seating space.
http://www.angelandboho.com/dining-banquettes--chairs-305-c.asp
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Island with only minimal overhang at one end for say 3 people, so perhaps and Island length of 1600, but with overhang at bifold side of 300? Or maybe even 1400 with 300 overhang, position small backless stools at this point
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