I note that the dimensions for this island have been previously given as 90" x 60". Would you please advise if these dimensions are the FULL measurements of the counter top, or is that the size of only the cabinetry below? Also, can you please tell me if this is the main/only sink in the kitchen? Looking at the photos, it appears to be the only sink, but I just want to confirm that. This information would be extremely helpful to me as my kitchen remodel began today and I need to quickly make some final decisions. I truly appreciate your help!