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An idea that I posted in another thread, that I haven't tried yet but am considering for my Metro because there is so much open space in the engine compartment, is molding some foil around parts of your engine that you would like to insulate, similar to configuration 3 in your pix, and then spraying on some "Great Stuff Fireblock" foam. I'd give it plenty of time to cure because of the temps, and the fact that this stuff seem to cure unevenly if you try to mess with it too much while it is curing.
You could do it in sections, and then you have a custom fitted insulating shell that can be easily lifted away for maintenance and warm weather use, and could also be trimmed with a utility knife if areas, like around the exhaust, are retaining too much heat.
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