It looks like this aligns perfectly with something we’ve just released—Rhino Sync!
Rhino Sync enables multi-user collaboration in Rhino, allowing users to lock, reload, and sync objects—including geometry, blocks, layers, and attributes—within a shared 3dm central file on a network drive. Future updates will expand support for platforms like Google Drive, OneDrive and more.
It’s currently in Alpha and available for free. If you’re interested in testing it out, you can download it here:
We’ve also started a discussion thread here:
We’d love to hear your thoughts—let us know what you think! 
MKS