While the 4Ground barn I assembled the other day is very nice, nothing says 40K at the Republic of Northcote like a painted cardboard box!
Big enough to hide behind for even relatively large models, I thought it could represent a lab or factory. It could even be a central objective.
I also took the opportunity to paint the comm towers and guns that came with the bastions I made recently. These had been sitting with undercoat and gathering dust. Now they can gather dust in their final state.
A few bits and pieces like this scattered around, and on, the lab makes it look like it is open for business.