Nice little Spartan. TR3 Resin Glaze is what I would use to polish it up, it won't fix the scratches but it will protect what's left of the finish. The original case/base has already been replaced once, the blue one is from a 185. The Spartans had a black plastic base which suffered from the same problems your base has now. Some people have had luck with replacing the fins inside the base with pieces of wood glued in place.
Cari