Is the 2 pics yr cabinet doors? I look at the 1st pic. So I suppose the side board where the door attaches to, is not flush with the top(grey color) I visualise when u close the door, will there be a gap there? I think there will be. U can go to whoever house n look at their cabinets to see if they also have the same industry standard. To me, it seem wrong measurements of the wood. If I am correct, then u should really screw yr ID cos he got no common sense and say my contractor said its industry standard. Likely that part is cut too big and to remedy it would be very tedious.