Ohh, have no idea why I thought he was talking about the chassis mesh. This kind of lights are possible to do. You might want to check the real lights but most likely what is going on here is the brighter parts are pockets of air, the less transparent parts are simply painted darker from inside, or have a thicker piece of plastic on outer side. You can model a plastic part itself and render with translucency, masking out non transparent parts. Under the plastic place a material with very bright emmissive. For darker edges you could use UVs or vertex color, make something like a bevel with multiple levels and then paint vertices of the edge darker.