Igaro D1 "Next Generation" Dynamo Hub Power Converter Reviewers Required

Say I wanted to build a bike that has the electronics as follows, would this device support it?

• Dynamo hub
  
• Front and rear lights
  
• Di2
  
• Built in cache battery that runs the Di2 rather than having a separate battery, and also supplies everything else
  
• Igaro
  
• Garmin permanently plugged into power
  
• USB charging port in stem area for ad-hoc device charging
  
  

I'm imagining D1 to battery, battery to every electrical system, but am very ready to be told that that's a stupid way of doing it.