Those files are used to create all the views in the manual. You can load them into OpenScad and press F5 to see the assembly.
You can also open any of the scad files in the scad folder and use F5 to see the assembly they correspond to. main.scad is the entire machine. It might take 20 minutes to render but you can pan and zoom reasonably quickly after that initial hit. You can also then load any other files and they will render much faster as the results of rendering main are cached.
If you want an exploded view set $exploded = 1; at the top of the file.
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