The floating rock idea is very good, and I like the interesting back story. The separate floating rock attached to the main one and the cantilevered tower are very nice touches, as is the crane to bring up the people and supplies.
Very nice work. It is a unique MOC. The rock itself is very interesting but having the tower and market really made this MOC. Good job. I really liked it. Reminded me of some fantasy works I saw or read years ago.
Wowzers! I really like floating rock moc's, but this one is just to awesome for words! I love the thin rock it is standing on, and the combination of so many different minifigs and facial expressions gives it an alive look, really like you captured a moment.