The main site looks good. Changing the maven-site-plugin from 4.0.0-M3 to 4.0.0-M4 changed the whole look and feel and fixed some variable issues, was showing "Last Published: $dateValue", not shows a date.
Changing the doxia-site-renderer artifact from 2.0.0-M3 to 2.0.0-M4 is what breaks the maven-pmd-plugin looking for the old maven-default-skin.
I'm not sure how to set the pmd for the new skin or how to customize the site menu to have links to custom reports.