Sorry, the best I can offer are completed pictures. Pretty boring.
Interior:
http://i.imgur.com/CCgtZqk.jpg
Exterior:
http://i.imgur.com/Joa2zFv.jpg
The fan exhausts under my deck, whose surface is about 6.5' off the ground.
(Remember, it's a walk out basement)
Drilling the hole was an adventure. I had to go through the deck's ledger
board, the cedar shake siding, then the rim joist. Roughly 5" in total
depth, but with 1.5" gap between the 2x ledger board and 2x rim joist.
The biggest issue was that the bottom of the ledger board is flush with the
bottom of the sill plate, not the bottom of the rim joist. I had to find
a vent cover that I could place high enough on the ledger board that the
hole would clear the sill plate. I wanted to use one with flaps, but the
housing on those didn't allow me to mount it high enough.
I drilled a series of holes with a 1 3/8" spade bit and then rounded it
off (sort of) with a reciprocating saw. The hole is far from perfect, but
caulk behind the vent cover and spray foam around the duct sealed it
nicely.
I tested it by hanging a piece of toilet paper on the screen door opposite
the fan. The toilet paper hangs straight down until I turn the fan on. Within
2 seconds the bottom of the toilet paper moves about 2" away from the screen,
so I know I am getting good air flow all the way across the room.
I'm ready to paint the repurposed hutch-kitchen island, so we'll see how
well it keeps the paint fumes from smelling up the house.