The larger air scoop on the Port access panel was fashioned using the soft metallic material from an old cream tube. I wrapped a strip of this around the kit's access panel to use it as a mould and shaped the metal with the aid of a sculpting tool:
Here's the scoop after it was cut out
And here it is mated to the panel
The rest of the smaller air scoops were made out of the stiffer aluminium sheet and shaping them over a half-round needle file.