Photo, please. Us creative people do better with visuals..

Custom. But you lose a lot of seating with curves. You might get two people there on something curved. Plain chairs will work better.

Is this whole dining area very large? The reason I'm asking is that it appears that with a bench it is going to have to be put more into the room so that people can get around the table to get in and out of it as you have walls on each side that are some what of a barrier. With chairs it appears that you could push the chair more into the bay area and still be able to walk into that area. Is there a possibility that you could put a rectangle table in this area with one end with a chair into the bay area and then use a bench on one side of the table?

Based on my own experience, I'm not a fan of benches for dining tables. They are hard to get in and out of, they are not comfortable and people like to adjust their chair as to how far they sit near or far from a table. Which makes it very hard to do if there are more than one person sitting on it and benches are usually on the heavy side. Plus, I really don't like the feeling of sitting on top of someone while I eat and since your space isn't very large, that is what it is going to feel like if you are planning to sit more than one person on the bench. I know this isn't the answer you are looking for but just wanted to give you something to think about.

If you google search curved dining bench you may find something that will fit into that area. Just disregard that the windows go almost to the floor.

Alton Banquette W715-BQ - Our Products - Vanguard Furniture · More Info