Ah I see. I actually got a farmhouse drop-in from Ikea, but it was wider than my sink base so I had to trim some material out of the neighboring base for the strainer. Then I used wall cabinets to make a coffee bar base with a bar sink, which also required some trimming. To me that seems like a reasonable amount of tweaking. So if you want everything to just fit by default that could be a problem. I still think they are very easy to work with and "customize" with relative ease.