Sorry for the delayed response.Originally posted in cdnusers.org by mcatramb91
With all of our projects we generate a Fabrication Drawing Gerber file which contains a dimensioned board outline and critical features, drill locations, drill legend and fabrication notes which outlines the PCB requirements (material, finish, soldermask, silkscreen, etc.) This Fabrication Drawing Gerber file is included with all the layer gerber files, ncdrill / ncroute files and IPC Netlist file with the data package to the PCB Fabricator. This drawing is used by the fabrication vendor so they know how the PCB is to be built and most vendors will perform final inspection of the PCB with a printed out version of this gerber file.
Hope this helps,