Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4101467.

I made this so I could created the referenced track loader as a non-functioning static model, while still being able to use all of the parts and possibly convert it to functioning in the future. This mounts to the servo mount points using M2x12mm screws, and provides a mount point for the wheels and bucket arms.

It may be useful for other projects as well.