Nice project.
Let me suggest you another goal:
Integration of psi with Padre, the Perl IDE.
IMHO many developers - especially those using Windows - will prefer
to have a GUI tool over a command line tool.
You can already write plugins to Padre in Perl 6 and run it in the same
process as Padre runs. So basically you can load the code of psi into Padre.
If its IO is not hard coded to STDIN/STDOUT then it will be quite easy to
connect it to Padre and thus provide a GUI for the Perl 6 documentation.
I'd be happy to help you with this.
regards
Gabor
http://padre.perlide.org/
So just to have a proof of concept of the integration,
I have uploaded Padre::Plugin::PSI to CPAN
that uses Perl 6 and Rakudo.
Gabor