Duster Rear Window Louvers

That's fine. This is just the basic I threw together when I was awaiting measurements. The end can be lengthened, and the original gaps brought back. I'll get to work on that now. Hopefully I'll have it all done within the hour. What kind of depth are we looking for here in these slats? Obviously, too deep and it'll stick off the window too far. So what's the ideal?