santa maria pit

I recently found this grill for sale on Craigslist in Dallas. The problem is that I live in Iowa. I've tried emailing him to get some info on it but he hasn't written me back. It's basically a Santa Maria style pit with a roasting box. I don't know if it was custom made but if not I'm trying...

OK for the Nor Cal pre-bash that will be held at my house this friday evening, I have a 35 pound suckling pig that I am going to cook in my 30 inch deep Santa Maria pit. My pit is heavily insulated with fire brick so no heat/air can escape the sides I'm thinking about stuffing the cavity with...