To hollow the verniers, I printed to scale ZOIC blueprints found on the web.

They are then closed from behind with plastic card.

Except some on the nose, where they fall on the air inlet grid (that's the magic of computer graphics : a hole can be filled to its opposite). I will deal them after assembly of the cabin.

Gas caps are hollowed like the verniers.

In the nozzles, the center circle is drilled, which will be good enough for an interesting lighting with the small existing squared openings around.

Plastic discs are trimed to hold the blue LED. For the top nozzle, the hole is directly formed in the part. To ensure proper holding of the LED, I added an additional layer on each disc.