I had one that was rather involved, and had a lot of non-Freespace related parts and parts that I don't remember, but I do recall clearly seeing a fight between the Lucifer and the Sa-Matra from Star Control 2.
The Lucifer's shields were able to absorb a few blasts from the Sa-Matra which would have destroyed almost any other ship, but then the next blast overwhelmed its shields and destroyed it. The Lucifer never even got within range to fire its own weapons.
I also didn't even see the Sa-Matra, since it was firing from an incredibly long distance.
Then I remember someone discussing that if the Sa-Matra were to be modeled in the Freespace engine, what size it should be, and they eventually decided on around 10 km long.