Glacial progress but progress...
It's both a curse and a blessing to have the WnW Pfalzs online.
Resorting to my handy furnace tape, I duplicated the many inspection panels, hinges and other bits visible on the DIII.
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I then noticed the little missing scoops on each side of the engine cowling.

I found a sutible size sprue and vac-formed it.
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Difficult to see clear, I coated with some white primer.
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Perhaps a bit oversized but I'm going with them.
I can finally get to priming and painting.