For my avionics setup, I have looked around quite a bit and have decided to use a VPX-Pro for the relay system, and an Approach Fast Stack Avionics Hub.
This will vastly simplify the back of the panel and allow for future changes should they be required at a minimal impact on aircraft usability.
As such I have also been looking at the wiring layout and a good friend of mine, Paul, has been making up diagrams of the wiring layout that I hope to share at a future point. These will hopefully help many others in the fun and games of VPX-Pro and redundancy wiring.