Dragging this thread back to the original query (though the other comments have been very interesting), I've decided to go with Martin J's recommendation at post #2, viz: "Heatshield Armor" sheeting. I'll go with the 1/2" thick stuff...it is recommended for turbo diesels over the 1/4" sheet. I've looked into it and found favourable reviews on line. Seems like a reasonable compromise between doing better than fibreglass tape and costly custom blanket work. Will post photos of finished job....as long as it ends up as good-looking as the online photos suggest!
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