The last couple of evenings I've been mostly fixing things discovered since 17.10 Alpha 2 was released.
Annoyingly saving custom panel layouts simply didn't function, but the fix for that landed yesterday.
Now that saving custom layouts works, this is needed:
Other fixes prevent two volume applets from appearing in the panel, migrate workspace configuration/orientation between window managers and layouts and prevent two low battery capacity warnings when using indicators.
A new version including all the fixes and custom panel deletion should land in the 17.10 archive tomorrow.