What about building a guitarron?

The guitarron is a unique stringed instrument used in mariachi music. Mexican luthiers are the most prolific makers of guitarrones in North America. Many hail from Paracho, Michoacan, where guitarmakers have established a tradition of constructing some of the best guitars in America. Locating blueprints and instructions in English for building a guitarron is really difficult. If you really want to construct a guitarron, perhaps you will take Ken Cartwright's advice. He owns Cartwright's Music Repair in Stayton, Oregon, and suggests that the most effective way to learn how to make a guitarron is to take one apart and then rebuild it.