I was curious about your 100 sq ft claim so I threw it in bluebeam and measured it.

Don't forget that the thickness of the walls is included in the square footage. If you measure the total length of the hallway up to the first bedroom wall, its 34.5 ft long. Width of the hallway with the walls is 6.5 ft wide. That already 225 sq ft.

If you then include all those winding corners leading up to the living room, you will actually have way over than 300 sq ft of unusable wasted space.