Starforce Production ships do not come with a plugin (most ships do, but those dont), youll have to make your own plugin for the ship in order for the ship to show up in your menu list...
here's what to do:
unzip/extract the files of the ship after downloading it
then copy data, scripts, sfx folders (that are in the download of the ship) to your BC install and overwrite when asked...
get the program Bridge Commander Universal Tool located here:
http://www.bcs-tng.com/portal/?q=bcsmcthat program will create the plugin for the ship - the program comes with instructions on how to do so (but if youre still not sure, please feel free to ask)...