Wow that looks great. i am working on building my own sawmill in HO but i think i could probably put it inside that one 3 times even though it is a larger scale.
There is over 1,600 pieces to the mill and over 125 metal castings.
The Planning Shed is made to butt up against the mill, in fact you can see part of the Planning Shed tramway on the back side of my mill.