I really like the godmorgon vanities but the largest size which is almost 56 inches only comes with a double sink counter top. I would like to add a custom counter with only one sink on one side. I would also prefer an undermount sink and am hoping to cut out a U shape in the top drawer to make it all fit. I am assuming I need a shallow sink and perhaps a thicker counter top to make up the space. Does anyone have any experience with doing this and any advice?