there is IRC channel for #ddtp for discussions.
I've tried to setup DDTP on local VM on clean Stretch installation
using your puppet manifest. I've updated it and fixed some problems .
Apache configuration should be updated as well. I haven't touched them
I wanted to work further today, but I faced that ddtp2 still down and
it's not possible to download db dump anymore.
BTW I checked  and control interface for Xen node is down as well.