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One thing I've always wondered is if it would be practical to direct rammed air from the front into the frame tunnel and into the engine compartment.
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That would be 1500 cubic feet per minute through a cross section much less than 1 square foot, considering it's full of the shift rod, hand brake cables and gas line. The skin friction and interference drag would choke it.
The louvered diffuser I suggested would only turn over the air trapped under the engine tin. The lower tin would remain (per Bob Hoover) and it offers 1500 cubic feet per minute of activated air to use by any Coanda nozzles that might exist.
Here's my take on the side view you posted. The template is slid back a bit from where you placed it.
Here's another picture with the bike rack that I hadn't posted before:
The Ron Lummus wing will definitely choke a stock cooling system. It's probably intended for running with the hood off.
This is standard race practice. It eventually grows into a rectangular box that completely encloses the engine. But it's for stability rather than low drag, so there is no plan taper, and the side plates are longitudinal instead of tapering off the drip rail.
The rear view out of a half-body of revolution is problematic. I prefer a Tropfenwagen style tail. Here's what happens to the rear view. I made a cone with the same cross-section as the stock back window. The vertex is forward of the rear-view mirror the same distance as reflected to the driver's eye. The intersection with the added tail is flat on the top and bottom and curved on the side as shown, even though the back window's top and bottom are curved.
The visual cone is based on a big back window, even though an oval window is shown.