Critique my lair plan please :)

I have a slow day at work, so I'm planning my lair construction. So far the only thing I have built is the initial 3-way corridor, so these plans are able to change easily.

Using a template I found here on the forums, I made up a spreadsheet to help plan my layout. Here is the current version:

http://members.cox.net/rodburns/dragorathlair.xls

I'd appreciate any input I could get on this. My lair is in Slate Crest, right next to the Slate Golems and slate field, so I want to put the Stone chamber on the first level and make it public for crafters to use. I thought I'd also put an essence chamber there so there's a scholar desk for anyone wanting to skill up with slate spell shards. Other than that, I'm open to any suggestions or advice from the veterans.

I'm especially stumped once I get down a ways. Not sure what to put around my T6 hall (yes, I am planning for *way* in the future :))

Thanks!

Well, since you're 5x5, that means you also have 3 more levels that you don't show in this as well. I'm not sure if a T2 library takes up 2 squares or if it's only 1.

a t2 library is slightly bigger than a t1 silo

T2 library takes up about 1.5, so it takes up 2 in reality.

My lair is 5x5x6 I believe, and yeah I haven't done the bottom levels yet :)