I’m sorry to revive an old thread, but I’m facing this same issue trying to implement theme locations. If it would be best to start a new thread, let me know.
I have added The useful part code above, but I’m not sure what to do with the hooks my_header_hook and so on. Do I need to create a function() and add_action() in functions.php, and then call them in the header template? I’ve experimented with that, but it’s not really working as expected. The positions are showing up in the layout Theme position dropdown, but I’m unclear on how to link that to a location in my template.
@julia I know it’s been many months, but if you happen to still have the zipped barebones theme, I would love to have it as a reference.