It can be treated as a group of rectangular cuboid (a box) . They just get re-arranged in a way that fits functionality. Parameters are they can’t be all on the ceiling or the floor. But consider water and electrical are paramount to the project, those who say i moved x to place y for space doesn’t really mean much. since space is being transfer from one area to another. In any case, the garage is ideally the most useful space since you can stack containers of stuff in it without worry. Think gear in a box can fill that volumn without an issue. The same applies to clothing, inconviennt? Yes but more effective since cabinetry could lead to empty spaces do to opening the side door.

Not only is everything is a box, but treat each box as a potential for a folding table. That each end of a vertice can be extended

Each counter can be modeled as a cuboid, with its faces serving as potential hinge points where a folding table may be attached; the table’s extension xx is constrained so that 0≤x≤LF0≤x≤LF​, the length of that face. Additional constraints like collision avoidance and hinge strength refine the model, ensuring tables don’t overlap and remain mechanically safe when deployed.

the beauty is the orchestration of box faces and table extensions in places we can imagine to be useful.

Multi functionality if possible to be described as something that can be used for more than one purpose. Begin by limiting what purpose each box serves and what can be done to increase its functionality. If its unable to be multi functional, consider why it must be there. ie a fridge serves only one important purpose: to hold beer.