I just realised that the Dorsal Anti-Collision Beacons were supposed to be light red, and not the 'normal' red that I had been setting them. Judging by which ships have light red beacons and which ones don't, I guess I forgot somewhere between starting the Commando class and finishing the Commando class 8 months later.
D'oh!
Fixed.

I forgot to set the blueprint tag to "Wimpomanufacturing" (I'm out of practice lol).

Accidentally saved the thumbnail as a PNG instead of a JPG. Fixed.