Leander Walnut Drop-In Single Sink Bathroom Vanity with Wood Top from Lowes (this picture doesn't do the unit justice - I really liked the display in store)
Bradstreet 30-in x 21-in Driftwood Undermount Single Sink Bathroom Vanity with Cultured Marble Top - Lowes
Dreamwerks 34 in. Contemporary Vanity in Cherry Radford with Marble Vanity Top in White from Home Depot
actually, i would make a horrible mess of this if i did it myself -- requires an expert carpenter. but it's such a great idea for the thousands of less-than-stellar mid-century modern pieces turned out in the 1960's and 1970's that can now be found at thrift shops...better workmanship than typical cabinetry now.
love this mid century bathroom. those angled cabinets are wonderful!