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For the hatch ducting I was picturing tubing welded together in an upside down U shape on the sides & top. The tubing would have a slot milled in the trailing edge for the air to exit. Similar to a stalled rear wing.
I might try just sucking the air in from the underside of the car first. Flexible ducting hose from a race supply shop may help facilitate routing to the suction side of the turbo if you want to bring it from the front of the car.
I would put the turbo directly after the cat, for simplicity sake. If it doesn't work out, you can get a pipe made to put the exhaust back to normal.
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