Where does the housing project begin?

Where does the housing project begin?
This is hand made.
Have we forgotten this for a long time? It has not worked so long ago. The mountain designers fit the rooms to each other without taking into account the crossing spaces, semantics, or logistics of the movements of people, furniture of objects...
And abroad they appreciate and love when some of the project is done manually, with a pencil.
So hand made by any designer, the architect must have