Looking good Jay!  Glad you like the host, I figured it was right up your alley due to micro-like size and heavy brass feel.  

  [highlight]And boy, it looks like it is just about the same diameter as your keychain host, maybe thinner? [/highlight]
As for the pictures, they just don't do this host justice, I don't think any pictures would.  ;D  It is so much better looking in person. The knurling (right word?) and overall features on this light are very nice, even has a option to thread some rubber into the 3 grooves on the side like the Kryton barrels.  For a relatively cheap flashlight from DX, the quality is amazing, especially the chrome finish and heavy feel.  It definitely will make once fancy laser, that's for sure.   [highlight]Oh, and just like the keychain mod, the host itself acts as the heatsink right? How well do you think that will work as far as proper heatsinking is concerned?[/highlight]
I like the light so much that I couldn't resist buying the CR123 version of this a few days ago.  Same look and build, just slightly wider (but shorter) and probably heavier! 
http://www.dealextreme.com/details.dx/sku.11669
BTW, have you tried it with rubber inserts?  I'm just wondering what it would look like or if the rubber would actually stay put.