4) I've purchased a 1200 cfm fan which will sit on top of the upside down trashcan. I will cut a hole in top of the trashcan and fan will pull air through hole and vent through flex duct and out the side of the house.
Why a trash can ?
Virtually all non-metal trash cans are made of polypropylene. This is the most annoying substance on the face of the earth because
absolutely no glue will stick to it except for an insanely-overpriced two-part epoxy from 3M that costs $120 per tube. JB Weld claims one of their products can glue polypropylene but I know from firsthand experience this is a lie.
Anyways. Don't try to make DIY stuff out of anything involving polypropylene, you'll be kicking yourself as soon as you realize you need to glue something somewhere.