Variation on the Keep

This isn't my map, but it's one I want to share.  Some time ago, harmyn, a Dragonsfoot member, created this map, in the style of the eponymous Keep from module B2.  I posted it in this thread at DF, but it disappeared, and another member, Shadowshack, reposted it.  I wanted to go ahead and put it here as well. 

This map would work great for a sequel to Keep on the Borderlands, right?  I'd like to see an expanded set of Caves to go with it--maybe something like this.