The picture below is of a cold room. My initial sizing estimate, which assumed that 15% of the cold room floor would be empty, didn't have nearly enough space to arrange the tanks and kegs in a usable fashion. The modeling process convinced me to bump the empty floor space to 50%.
The next picture shows a mill room. It's not much to look at, but it was nice to verify that my initial sizing estimate would fit a mill, two pallets of malt and a pallet-wide door path.
I went two for three on my initial sizing estimates. Not bad for my first time!