One other note. When I installed the sink in the cabinet I bedded the bottom of the sink in some mortar so that it would be fully supported. So that it would be easy to remove the sink (I was in a rented space) I put down a layer of plastic in the cabinet then the mortar then another layer of plastic. The thin painters plastic works well. Once the mortar set I then caulked around the edge of the sink with silicon sealant.

Roger