After dealing with a stand-in brush "model", I've finally got my hands on a proper egg carton from: https://grabcad.com/library/simple-egg-carton-1
Unfortunately the author did a bit too good of a job on it, and Crowbar was not able to compile all of the geometry, so I had to decimate the hell out of it:
It turned out a bit wonky after removing so many faces, but at least now I was able to get it compiled and in game. For my purposes I think it fits fine:
(Sorry for the bad lighting, this was a fast compile) You can see the original brush model I was using toward the back.
The initial version of de_dozen has been out for about a week now, but there's been a lot going on since then. Loads detail improvements, fixes, soundscape implementation, and more will be coming in the next update, which I plan on publishing the second week of July.