Yea, I don't have an airbrush! Although I find I can paint fine without one. Sometimes I think airbrushes look a bit too soft. I didn't use the rough stenciling with the AT-ST. The AT-ST was actually quite simple to paint. Just one color of model paint spray, and the rest was done with varying degrees of pastel work. The small cans of spray paint you see in modeling stores work pretty well to create very fine layers of paint. I use some cotton balls and Q-tips to get the pastels on the model after the paint dries, sometimes I even do that before the paint is complete cured as it grabs better and can form subtle weathering effects. It's surprising how well it stays on too! Although I will eventually spray a light matte clear coat over it. I'll take some close up pics soon! I'll also take a picture of the pastels I'm using. Basically a range of earthy tones , white, grays and black.
One thing I don't normally do however is the dark wash and wipe off technique that you often see. The reason why is because I think it accentuates some of the paneling/details too much, almost like a kind of artificial outline around too many of the details. I may do it in some small spots, but never over the whole thing.