You should have a minimum of 18" between countertop and the bottom of the upper cabinets to allow for appliances as well as enough clearance for food prep. Base cabinets will end up with a height around 36"ht with the countertop. Bar height is usually around 42". Upper cabinets can be 30" in height or taller depending on your ceiling height and whether or not you are taking them up to a ceiling or soffit. Make sure to adjust for crown moulding on the cabinets or wall.

I have. I have gone for beige walls and beige quartz countertop. my kitchen will get ready in a week's time. I shall then post pictures and seek feedback from the experts on houzz.com.

If you will like to go little different than Indian / traditional one, mint green colour is in trend and goes well with brick colour walls. Looks good if you have white appliances, crockery and some other elements that are visible with it. (Sourced from google images) https://goo.gl/images/Wyu1kR

Hello Abinash, Correct me if I am wrong in my guess that you liked the basin so much that this entire unit was build around it :) that too in the centre of the room. Jokes apart, the base cabinet doesn't provide a few inches gaps to the user for keeping the foot comfortably while using a hand wash. Have you considered the water proofing and maintenance of this unit as what it appears it is wood with laminated top as of now. Do you have a floor plan, as it is a surprising positioning of a hand wash. Thanks, Nitin CORNERSTONE DESIGNS Bangalore