There are just some ingame shots and a small blueprint of Jabba's Palace, but there is also a secret passage, so Jabba could escape if he was in danger and the complete building was built to accomodate Jabba's huge bodymass
I would love to see a similiar map to the GC Dune sea, it was huge. It had the palace, the city in the north, a huge desert in the south with the Sarlacc, ruins, and a whole lot more. Next to Hoth, it was one of my favorites. I'm not saying it should be cloned to FS, but something similiar would be great.