Without seeing the inside that appears to be in darn good shape for 18 years old!
List price new is like $1700 plus shipping. Which is shall we say "pricey". P&S still builds a good product but they are not currently at the top of the list for many cookers down here.
You could easily sex up an ad about the "world famous Pitts and Spits from Texas". Not sure what the market would bear where your at or what you have in the pit, so thats a tough one.
And you should give it a test run, I don't think management would be as consuming as you think on a chamber of that size. Start with about half a bag of kingsford to get things going and add wood after that.
Post some shined up pics when you can and good luck!