Installation

In Blender open Edit, Preferences, Get Extensions, then use Install from Disk and pick the excavator_generator zip.

Usage

1. Open the Excavator tab in the 3D viewport sidebar (N). With nothing selected, click the picture to choose one of the 54 designs, or browse the ten families, and add it at the 3D cursor. You can also use Shift+A, Mesh, Construction Machine.
2. Select any part of a machine to edit it. The card at the top shows the design; Surprise makes a new random machine, Vary changes the current one a little, the palette button picks a random livery and wear, the tool button swaps the attachment and the arrow resets the design.
3. The tabs hold every setting: Machine (kind, tracks or wheels, size), Work (arm, tool, loader, blade, ripper, dump body, rollers), Body (upper, cab, extras), Finish (livery, colors, condition, mud, dust, rust, lights), Pose (one-click poses, joint sliders, Key Pose) and Parts (detail, seed, rebuild, delete).
4. To animate, set a pose, press Key Pose, move to another frame and repeat. The pose values live on the machine's root object.