We had our bathroom remodelled and just had the sink mounted in a marble vanity unit which was attached to the wall. We decided (or more truthfully, "she who must be obeyed" decided) that we needed some storage underneath so I had to come up with a way of retro-fitting a cabinet without making too many new holes in the tiles.
This was a very easy build using no complicated joinery or other techniques. Although I did use a table saw to make some of the cuts I could easily have just used hand tools.
It won't win any awards for carpentry or design but it works and looks ok.
Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.