This part (in other kits I've seen) is made of clear plastic so my thinking was' Tamiya did the same "trick". After checking the instructions for your model I saw it's solid plastic (part B15). The instructions suggest paint X-11 for the transparent section which is silverGood correction call. So many 'examples' of builds out there to reference and all seem different! Not sure what color could represent 'clear' the best. Perhaps a muted color of the fule that was in the lines? Very, very, palish yellowish green? Or just a very light grey?
On their own site Tamiya-builders did it with silver (I believe) - see here.
I would do it as you and Wojtek suggest - some pale yellowish grey with gloss varnish on top of it.
Cheers!
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