What kind of counter top. I'm not familiar with that sink. Is it to be under-mounted? Will there be counter top in front and behind it? Where will your faucet holes be?

Going with quartz counters, and it is an undermount sink, no backsplash. Will have holes drilled behind sink for faucet.

While the 405D is 20-7/8", that's the depth on the side w/the bigger bowl. The depth on the side w/the smaller bowl is 18-3/4"

Most people put the faucet above the small bowl but next to the large bowl (i.e., not quite centered, but b/w the 2 bowls)

If you can find a picture of Alku05's 405D sink installation, you'll see what I mean. She has a picture somewhere, I just don't remember which thread (do a search on Alku05 + S405D or something like that...using the search box on the bottom of the page.)