Categroize Mass Components and display symbology in RocketFigure

I like to use OR to design scratch built rockets.  I have fairly complex designs with dual deployment, backups, etc.  When I look at the side schematic I would like to be able to quickly tell if I have all the mass components I need.  To assist this I have added the ability to specify what type a mass component is: the default Mass Component, an Altimeter, a Flight Computer, a Deployment Charge, a Tracker, a Payload, Recovery hardware or a Battery.  These choices are available in a JComboBox in the MassComponent config dialag.  

There is a unique symbol drawn within the bounding box for the mass component.  The MassComponentType enum is saved within the mass component portion of the file, so it is persistent.

I am not completely happy with the structure of the MassComponentShapes class given that I use a switch to determine what to drawn.  Still it works quickly.

I am open to  suggestions for improvement especially for the symbology.  I also have only provided an english translation.