Thank you for the nice compliment! The top of the tub deck is one piece, but you'll notice it doesn't wrap back to the corner because this particular corner tub is a drop-in model. The single piece is only the bench seat, the front of the tub and the right-hand side by the vanity. The size, thickness and material of a fabricated piece of stone can affect whether or not you'll be able to get what you need cut without seams. This particular tub deck is brown onyx (not a granite) and we purchased 2 slabs in order to complete this bathroom. Best of luck and let me know if you have any additional questions. You can also check out our other remodels at our profile:
http://www.houzz.com/pro/simply-baths/simply-baths-showcase-kitchens