All mechanical rooms designed and plotted in real dimensions in three-dimensional imaging with modern market software.
Using the” rich” library of materials and components we already have, the drawings are quite real.
Drawings also mention  elevation  from finished floor.
After the 3D design is completed, layout of the mechanical room is given (scale 1:10), plan – side views (as needed) on the same scale and of course real time video for a proper understanding from the constructors and installers of all mechanical room subsystems.
Also given is a detailed bill of materials required for the  construction of the mechanical room.