Creating Door Openings
One way to bring some life to our static models is to have open doors in our structures. I selected three of them to be open. This is not a decision to be made lightly, because open doors will require some interior modeling, leading to more work down the road.

The DPM walls are very thick. The score-and-snap technique of styrene doesn't really work here. The only method I've found is to drill holes in the sections to be removed.

The challenge is to drill holes around the whole area to be removed without the drill bit jumping to the previous hole, and without damaging the parts of the walls that are to remain.

Next I use a sharp knife to cut through the webbing between the holes, so that the center section can be removed.

Then it is just a matter of trimming and filing the remaining debris from the inside of the door opening.