how do I create a new template on civicrm / mosaico
Thanks for this - it helped me out.

I believe the second part of your answer is no longer valid.

The new place to reference your template seems to be in: uk.co.vedaconsulting.mosaico/CRM/Mosaico/BAO/MosaicoTemplate.php.

Edit the findBaseTemplates() method to return another record with your new template's details and it should show up under the Mailings -&gt; Mosaico Templates menu option in the New from base template: section