The centre of the house the core of all problems. The highlighted circle indicates the same. This core had to be cleared for a better transition of spaces and privacy.
The bathrooms plumbing and tiling had to be redone entirely due to bad execution of work the first time and poor maintenance. The inclusion of partition in kitchen was done to correct the Vastu defects complained by the clients. All the other design proposals/changes are all in accordance with the Vastu guidelines.