The sink-table that I built. I need to cover the top, most likely will be FRP, and I will use FRP around the walls to protect them from splashing.
I have the water and drain plumbing complete. This was a major improvement over the way I used to have to move the water.
Still have a ways to go on this project but it is coming along.
Hmmm....now you have me thinking....which can be dangerous, of course.
I have an old metal sink w/ sideboard I salvaged from a junk day here in town. You can see it here:

But while it's great compared to not having one, it's shallow, and doesn't have a sprayer, and isn't as large as I might like. I have to clean my kettle and fermenters in the kitchen, and I'd rather do it right where I'm brewing.
So--your approach above has me thinking....instead of buying a ready-made sink system, I could build my own cabinetry to fit the space, and drop in whatever sinks I could find to fit. I could use whatever faucets I'd like, and perhaps even permanently install the RO system underneath someplace.
Hmmm.....