I have something similar to that I think.

Are the windows going to be operable?

When you say 12' is that 12' of glass or, perhaps, 4 x 3' windows melded together?

We've had discussed this elsewhere and it is a little difficult to pull off.

I do not have water problems.

I am concerned about the water from the inside since it will be near the sink.

The window middle part is a panoramic window and the two on the sides are operable. It comes from the manufacturer as a unit.

If your contractor is suggesting it, he or she must have experience doing it...hopefully.

I don't have problems with water.

Here are two ways to do it. The first is the one I've seen most. The counter extends to become the sill. This usually needs a trim piece of some kind.

The second photo is pretty cool. No trim piece.

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Just my .02. I had a home built- it had a sliding window over the kitchen sink that was fitted so only a thin metal track was on the counter- similar to photo two with the black counter. I cooked a lot then. Teens in house. There was a 'serving' part of the counter that was accessible from sink to lanai- so people could refill a drink, pass hot dogs/hamburger from kitchen to lanai. Lots of teens wet from pool grabbing a drink. We lived there for eight years. The windows were not wood framed, maybe powder coated aluminum?? Fiberglass?? Anyway that window looked as good as the day house was built. I will build again fairly soon and am absolutely going to have another sliding window above the sink! IMO it is safer to have NO backsplash of any kind below window because there is potential for water to seep between the materials, causing damage. Maybe this will not help you because Infinity is a wood style. Sorry- was too lazy to look it up...

Ed, thanks. Apparently, fiberglass windows would not give trouble with water of any kind. The problem is that my husband hates the look and insists in putting a wood window!