Here's the vanity once it's modified. You can already tell how much smaller the sink is compared the the medium sized Kholer. With the sink installed, and the cabinet topped with plywood so everything is ready for granite and then the plumbing fixtures.
Most people want a larger bathroom cabinet, but in this case, the delivered cabinet was way too large, and would have been overbearing in size for this small bathroom. The smaller size doesn't reduce the working space by much at all, and leaves a lot more walkable floor space available.