Engine bay cooling assistance?

[nick000]

Typically when you are at speed air flowing through the engine bay goes out at the base of the windscreen so I wouldn't worry about that.

Bear in mind that you mostly want to maximise air flow to the radiator as it is water cooled.

You could also use a p.1 grille from a sports model, as yours looks like it barely has any holes in it.

That was my thought with the grill so I have cut back faces out to make the proper "louves" pic to follow...

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Car designers know what they're doing

Yes they do, but also have a different goal from myself i.e. they are not trying to produce 150% of the stock bhp