I took the dinette out of my 280 because it was too small and uncomfortable for normal sized people to use. I actually meet another 280 owner like yourself and discussed trading the dinette setup for his chairs and he was happy to do so. Unfortunately he sat at my dinette for a few minutes and decided the chairs were the better set up.
I ultimately bought two 34.5 chairs from Brad and built my own wall cabinet and table. The 34.5 chairs are larger than the 280 chairs and the fit is snug but much better than the dinette. There are just two of us and the dog so your situation may be different but spend some time in one of the original dinettes before you decide.
"Socialist governments traditionally do make a financial mess. They always run out of other people's money. It's quite a characteristic of them."
~ Margaret Thatcher ~