Erischild, you may be closer to what I am asking for, but maybe not quite. I remember all through the Beta that there was supposed to be a way to create ship templates that were used to automatically create ship designs that automatically had the latest technology. You created a skeleton design that automatically got the latest engines, weapons, and armor, and gave the template a name that the game added "MK0", "MK1", (or something similar), ... to it. I guess you could call this a ship set, but it doesn't sound that much like modding (where you provide a complete set of factions, their characteristics, and their ships (or ship templates)).
I have been trying to discover how this (ship templates) is done ever since the Beta and have had no success.