Am in the process of building a functional prototype of the majority of the 3ub system. The idea is to be able to carry the demonstration system to some location, plug it into the wall, and demonstrate how it works by actually having it perform all the functions. There are essentially two modules, the safety module that would be installed by an electrician and the generator module that would be part of the power generator purchased by a consumer.
The initial system will not actually feed power back into the grid. That will be simulated. I will need to work with a micro-inverter company to add that functionality to the demonstration sometime in the future. All the communications via the power line, plus all the sensing and controls will be fully functional. The demonstration systems each have an LCD to display their status. All the components of both systems will be visible.
As a technical note, the demonstration systems are built using Arduino micro-computers, relay and power sensors, and homeplug powerline modems. The demonstration systems are physically much bigger than they could be in their final form. This is just a demonstration system. For example, the 1 amp power draw used to have the generator confirm it is downstream of the upstream safety module uses a 100 watt hanging shop light instead of small resistor. Makes for a better demo.