Nope, I've never seen the path the air takes on any type3's.
It sounds a lot more complicated than a type1, which simply go back to front.
But think about this. If the air was drawn from under the car, then exited through rear apron area. Going simply front to back over/through the engine. Then it would generate down force, and it could direct the hot air to a diffuser. This is the reason why I was being so specific on where the air goes, beyond my not knowing the exact route.
Here's the '60 split window that I've been drooling over for a couple weeks. I can't buy it today. But maybe in a week or two. Its a big maybe.... plus it needs a lot of work. (and I still like the delivery more)