I came across this today....... I mean the symlink error. In my case, nothing to do with Bower.
However, it actually works ( @bep )
So, in Windows, recreated the Hugoo content folder as a symlink to content_src (just as an exxperiment).
I get this 'Symbolic links for directories not supported', but Hugo does follow and the content is generated as it should be.
So i could do this, just have to live with the error. But am I missing something here?