The Blender Add-On has proved very popular and based on requests, I have made some additions to the plating generator which are free to all current users:

• Define the number of segments on the sides of the plates and within the grooves.
• An additional option of selecting the faces for the plates as well as the grooves.
• Add a bevel to the edges of the plates, and define the number of segments.
• This plugin is also tested on the upcoming Blender 2.79.

A short demo video of the new features is here:

You can get the Plating Generator from here.