I'd favour to remove all the existing Panels layouts and only provide a set of layouts that would replicate the exact same markup and the normal templates. Right now the markup differs quite much and can't take advantage of the core Zen stylesheets. Right now the Panels layouts requires to be maintained separately. We don't want that. And I think it's fair enough to actually remove them since Zen 7.x-5.x still is in dev.
I'd also like to add the
panels-pane.tpl.php to Zen and replicate it's markup and classes (i.e.
.block) so we can take advantage of the responsive stylesheets.
Sounds good? I'm currentlt running a client project where need this. So I'm on it.
Also, could we add a new component to this project for tracking the Panels stuff? There might be more things coming :)