CentOS - Aug 2015 - Define mandatory desktop profile for a use on CentOS 7

I've been using xguest on CentOS 6 and this uses a locked down profile
that is read from /etc/sabayon/profiles/USERNAME.zip.

How do I recreate this functionality on CentOS 7? All the information
I'm finding about GSettings and dconf seems to apply to all users - I
need to define a profile that is only applied to the dynamically created
home directory for xguest.

Tom