After struggling most of yesterday day, I finally have the Maven archetype working.
Use the command:
mvn archetype:generate -DarchetypeCatalog=http://tapestry.apache.org/
This points Maven at the Tapestry-specific Archetype Catalog, you want the first option ("Tapestry 5 Quickstart Project"), then choose the fourth option ("5.3-beta-20").
I need to fix something broken in the CSS of the archetype; otherwise it's working nicely, and demonstrates a bunch of new features in Tapestry 5.3; it also makes use of up-to date features, such as using the @Import annotation (instead of the now removed @IncludeStylesheet annotation), and some Ajax features on the first page.
I may switch things around to make use of Twitter's Bootstrap CSS stylesheets.
Here's a full session of creating the application and getting it running; it took less than 30 seconds: