It's a very cool page. I think we've posted it before somewhere in the tangle. The final board looks luscious. The construction of the individual flagstones can also be applied to other types of dungeons (for the very dedicated!)
On an almost related note, Mortis has developed a printable HQ board using elements of my designs which we're thinking about bringing it out as a sort of "tribute" or "homage" to HQ.