I just replaced my entire center console, I wasn't able to find the parts used so I bought them from http://www.subaru-parts-dealer.com/ they have detailed line drawings so it should be easy to see how it assembles. Yours is virtually identical to my own.
The ash tray goes just above where your arrow is next to the lighter, and should just slide into place. I have before, & after photo's at http://starguard.zoints.com/album/?aid=1216 and now here at my photo gallery.
Assembly was easy!