Now the Soffits

So the underneath is done, so now I started the soffit. I seem to be working above my head all the time (in more meaning than one!).
This is where the soffit goes:

Of course I have to make them myself and they need to have ventilation to avoid condensation I am told:

And here is the first one. There are 20 to do and so far I have done seven but I only have picture of the first one.