For Joomla 3.4.3 in combination with Gantry 5.1.0 and 5.1.1 there are now test environments. As I said before I needed these test environments to help others and now it is ready. So come on with your questions.
You can find the test environment in the menu under "Gantry 5"
I am looking in to it to create admin access for all guests so that they can all see the power of Gantry in combination with Joomla. At this moment the admin area is at this moment only accessible by myself.