TARDIS from Doctor Who - First serious Blender Project [Cycles]

Album showing progress from first model.

Hey guys, first post on here (I think) but I’ve been active on /r/blender over at reddit with this project. Figured I should move on here and get some additional help with this project. As of now I have a good grasp on modeling and texturing, though I do need to fix a lot of mistakes I’m just putting them off till I got the scene working properly.

The problem I’m having right now is with DOF in cycles. I’m using a trunk build from graphicall and DOF does not seem to be working.

Also volumetrics, I know there is a patch for it in cycles. How do I add it by myself into a build? Do I need to actually build from scratch or can I add it like an addon?