Night Shift is a great YouTube channel that explores larger military dioramas and models. His techniques can work in other scales as well. This project was 1/35 scale but would also work for O scale. I really like his choice of materials as they are not something I would normal want to use on a structure. But it works, and works well.
There is always more than one way to skin a cat. I love seeing other solutions to a problem I have faced.