MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
The most recent versions of the .stl files are included with the sources on github at https://github.com/Lodran/Akimbo
Github also provides a complete revision history.
Unfortunately, the mechanism that Thingiverse uses to provide updates is very difficult to use, and isn't something that can be automated.