[dancer-users] How do I mount a Dancer2 app tree with Plack::Builder?

[Punter]

I followed this tutorial http://advent.perldancer.org/2012/7 and built a 
very small but structured Dancer2 application.

Now I would like to mount it as a PSGI application with Plack::Builder. 
What do I have to do?

This here app.psgi configuration definitely doesn't work: 
https://metacpan.org/module/SUKRIA/Dancer2-0.02/lib/Dancer2/Deployment.pod#Running-multiple-apps-with-Plack::Builder 
(it was probably built for Dancer1)

Thank you