30" is the height of lower cabinet and the depth is 24" the minimum width of a cabinet can be 6" and the maximum can be 3'. The upper cabinet width can be minimum 1' and max 3'. The height is 2' and the depth is 12" to 16". The counter top height must be finished at 30".
My previous experience and technical expertise did helped me in cracking this interview. You should have hands on experience on 3D CAD, V-RAY and Photoshop to even consider for this job. Newbies please don't go for it. They won't select newbies.