I did as Kats suggests several years ago with former house. I had room for a spacious vanity with a remodel and opted for one right sink, a bank of wide drawers for storage, and a much needed built in laundry hamper. A local cabinet maker made the vanity and a towel tower, GC installed corian top. I chose alder with a whitewashed and glazed finish, it was not a budget breaker.

Here is your dilemma. if you take down those fixtures there will be two holes in the mirror, that being said, they will be up high and most likely off center. So, to get new lighting that is not stuck in the corners, and covers the holes behind it, might be next to impossible unless you run a thick bar that covers the space. But some times back in the day they only drug wire over and did not put in actual junction boxes, so the bringing it to code might be another issue. 1. take one of the lights down and see what is going on 2. probably have to replace the mirror and move the electrical location.

Think of each sink on its own. I assume the sink will be centered in the 24" cabinet. So it can't be 24 inch wide, because you need space for a sconce on either side and the sconce should be a couple of inches from the mirror. So I would guess 20 to 22 inches wide maximum. So a search on the photos or products on Houzz to see if your cabinets come up. It is easier to make the right decision with some visuals. You can wait to until the cabinets are installed and the take on site measurements. I like rectangle mirrors the best for functionality.

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