The best way to build your own maps using the data Volt and Bad_Syntax made, along with the state, province and regional polygons I have created, is to use Geographic Information Systems (GIS).
A geographic information system is a system designed to capture, store, manipulate, analyse, manage, and present all types of geographically referenced data.
As planetary data is given in an X.Y coordinate system, so therefore GIS becomes very useful in mapping the BattleTech universe.
In order to use the data, you will need a GIS software package. There are several available from proprietary systems like ArcGIS and MapInfo, to freeware packages like QGis, QuantumGIS and GVSig. See Wikipedia’s List of GIS Software for more information.
In each of the mapping threads I have, following the map post, there will be another post with a .zip file containing the data for those maps. Download this data and save it wherever is useful to you.
Download one of the GIS packages and run yourself through a tutorial, as each package will be slightly different and it will save me the time explaining. Each will teach you how to use and manipulate the data.
Once you understand how to add layers (the data), play with its symbology (shape and colour) and learn how to export for the particular GIS package, you really don’t need much more. The data I have put up here will then be of use to you in creating your own maps.
For the weaker packages, you may need to play with the exported images in a vector or raster based image editing package: like GIMP; Photoshop; or Inkscape. However, more powerful GIS packages, like ArcGIS, can export maps that look the goods from the get go.
Any other questions, please feel free to ask here.
For ArcGIS users (ArcMap, ArcEditor and ArcInfo), I will be more helpful as that is the system I use, but I can provide pointers for other packages.