My cabinet maker is planning to make cabinets 21" deep. I have chosen Brizo Baliza widespread lavatory faucet. The faucet cut sheet calls for 2 1/2" distance away from backsplash. I have chosen Kohler Memoirs sinks. The sink cut sheet shows 2 1/2" from center line of faucet to back "cut-out" edge of sink. Sink cut out depth is 14 1/2" (overall depth is 17 5/16"). I am not sure what the distance from the front of sink cut-out to the front of cabinet and/or countertop should be. I don't know if 21" cabinet depth is large enough. I am leaning towards a tile backsplash, but if I chose to use the same 3 cm quartzite as I am on the countertop, I will have to add this backspash depth into the equation.