If utilizing Fabrication (between 4 Departments - Estimating, Engineering, Detailing and Production/Fabrication), what would best practices be regarding the use of MVparts vs Fabrication ITMs for equipment (VAVs, GRDs, Fans, etc...)?

Musts at any given stage:

1) Equipment Takeoff/Reports (including Model Numbers, Dimensional data, Equipment/Schedule number, etc.)

2) Association with a service/service layer, for ease of isolation by service (i.e. if one needed to create a supply service plot & a return services plot...associated equipment would isolate with the duct/fittings.

Our company has an extensive MVpart catalog utilized by 1 department only.  Should other departments move to MVparts, or should MVparts be replaced with fabrication ITMs?