PS1 Cepheids revisited

After doing some more thinking, learning a lot from Laura already, here's my current thinking about Cepheids:

1) in the context of Galactic disk evolution, Cepheids could should play the role of the ideal 'present-day', young star diagnostic.
They can answer: where and with what (detailed!!) abundances are stars born now.
2) With them, we can do the dynamics of "the other side of the galaxy" .

By now, quite a number of things are in the AS4 white paper by Byrd