It looks like "
v.io" is more public now. It has some interesting ideas as they relate to go packages.
Some interesting tools they made for their own use:
One file restricts which imports paths are allowed, another checks the API for breaking changes.
Another interesting datapoint is fuchsia's go packages structure. They choose to have a local "project" build style that includes a src directory.
Nothing ground-breaking but may be of interest to others. -Daniel