Hello, These are some tutorials for methods I personally use to create my props.
Pepkura Assembly
Pepakura is a method that is very popularly used to make quality props for a low price. Pepakura uses a program called Pepakura viewer, a program that uses .pdo files to create 3d models and template them to be built from cardstock. There are thousands of Pdo files on the internet to use, a great source of files comes from the 405th. Pictures were taken from Impact props, I do not own or take credit for any of these pictures.