The following gallery of images is from the construction phase of the steam shovel where you can see some of the techniques used.
View the embedded image gallery online at:
http://schsm.org/index.php/projects/28-building-the-steam-shovel#sigFreeId10540530a3
http://schsm.org/index.php/projects/28-building-the-steam-shovel#sigFreeId10540530a3