While cruising through the Republica system, I noticed several stations that are 'custom'. I.E., Custom defense, custom outpost. I also noticed a 'custom trading III'. According to the rules, there is only a trading I and trading II. What makes these stations custom, and how are they made?
Light speed is too slow! We're going to have to go right to...Ludicrous speed.
They were made before the current station system was introduced. At that time, station were modular, i.e. you could add different types of modules to the station. Those stations weren't changed (though they could be) when the new system was introduced, thus they remain with their old stats and a custom station type.