Not to detract from the splendour, but most of that is commercially purchased. The town buildings are basically all Tabletop World, the terrain tiles and hills and rivers and such (and maybe the trees as well?) are all by TerranScapes, and the dungeon is Dwarven Forge. The ships are models of course.
The one thing I'm not sure of the origin of is the castle. It may be one of TerranScapes' special one-off custom jobs.
Essentially, this is more of a demonstration of what an unlimited budget can get you. Still, it makes for a hell of an impressive table all the same.