I was going to suggest wind-splits for the tail lights, but I defer to Bicycle Bob.
Stand them off from the body on pedestals and they're further apart.
For the faceting:
This is an
octahedral based asymmetrical sphere with a frequency of six. If it had a frequency of one it would have one points on the top, front, back and sides. A frequency of 2-3 would give a reasonable compromise at your scale between flatness and edge [seaming] length. It can be created from a peel pattern on a large sheet.
The geometry makes picking edge lengths trivial.