Not only is the entire device a marvel, but it's held together with pegs and threaded wooden dowels with wooden nuts. It is even built in components, so that it can be worked on in sections. Remarkable.
If the YouTube video didn't satisfy, here is a higher resolution video of Del's Amazing Wooden Machine.
Also, here is a link to a few large photographs of Del's machine, courtesy of Art Maddox.
If you want to get started with this sort of thing (on a more modest scale), check out these books:
* Making Mechanical Marvels In Wood
* Making Wooden Mechanical Models
* Making More Wooden Mechanical Models
[ Thanks Del and Art! ]