Garth,
I was cleaning up the website a bit and removed the fan pics, sorry. They didn't really show the mounting that well.
The blower is mounted to a birch plywood plenum. I drilled holes though the top of the blower deck as far back as I could and still reach the bolts, I tried to temporarily remove the Squirrel cage but the set screw was in there pretty good. Using heavy gauge bolts and flat rubber bushings between the blower and ply, I glued and screwed the Plenum two inches below the opening in the bench and covered the inside with Aluminum tape. Everything was available from Home Depot, make sure you use lock washers as well.
As far as the duct connection, you have to rig something from the plumbing section. There are a whole pile of sheet metal reducers for vent pipes, you have to bend and cut one to make a flange. Stay away from the flex aluminum stuff, use the heavier rigid sheet metal.