This person figured out a way to leave the dinette and mount office chairs in it.
They took the base off the office chair so it was just the seat with a post coming out of the bottom then mounted a vertical 4x4 in dinette base, drilled a deep 1.125" vertical hole in the 4x4 and insert chair post to get rotating chair.
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/25969244/srt/pa/pging/1/page/2.cfmAt some point I saved this link for RV furniture. Don't know anything about the company.
http://www.glastop.com/rv-furniture-products.asp?id=70