Design 1 floor of an appartment building based on an excisting plan and a set of fixed parameters.

We have a design of a appartment complex, today it has 12 appartments on 1 floor. We want to change the lay-out and have alternatives with more appartments, a differnt lay-out. all whilst respecting a few fixed elements and whilst increasing living quality etc... perfect project for an architecture student or passionate. to be deliverd as detailed sketches, no need for dwg but can be ....