Model Wip

I have more or less worked out all the transitions from Public 1-2 to Private 1 and from Public 3-4 to private 2. Si now I know the main slab height transitions onto which I can project the plans. I modeled a tiny area of teh plan to bet feed back. I am not sure if it is best to model the slabs as thin slab and add or to model everything solid and boolean out. I think with the boolean it will be hard to understand hod the building is working.
Anyway, I have modelled up to the the level of each respective floor from the central distribution area. Now it is the question of if I project the plans onto the floor levels and extrude the circulation - connecting it the cores or if I work on refining a slab mass model?? I have to do both eventually.