Hi, @Anonymous , what I do is to model the more I can using plaster as a material layer in my walls, and ceilings (or bottom face of floors). Also use wrap at ends and openings to get best results. After that I create parts as needed to adjust plaster's coverings. If still needed, I use walls and floors with a single layer of plaster to cover vertical and horizontal materials, like faces of concrete columns and beams.
Create a material take off schedule and I think you will have what you want.
Hope it helps.
