Is the Robetta website available for hosting on your local machine for intranet access? (yes, I am trying to avoid working in a Linux terminal window at all costs ;) )
Not really, no. The Robetta server is something of a custom-built thing that relies a bit on the particular setup of the Robetta servers - it never was intended to be something that could be generally rehosted. Sorry.
The ROSIE server system is a bit more general, though, so it may be practical to rehost it.