Similar hobbies. ie: model airplanes, tanks, ships, railroads, etc., often have books on techniques that go unnoticed by modelers in sister fields.
For example, model railroads are really electrified dioramas and have lots of techniques we can use in making our models.
So you might want to see what books and DVDs are available that will teach techniques that are generally ignored in model airplane, ships and military vehicles forums and publications.
I suggest you might want to see what is available in the model railroad hobby. They have lots we can use.