Flourescent tubes are not completely transparent, they are coated on the inside with a paint that reacts to the mercury. It's a milky white so you could just make them opaque. Burnt out tubes will usually have darkening on the ends of the tubes.
Oh awesome! Yes I was trying to go for super old / burned out tubes, but your the second person who has said they look weird so I'll go for something more like what you've posted, black at the ends. Thanks!
Thanks! Some of the 4x4's (those without conduits) you point to are actually random brackets, but yea from the side the look like 4x4. Also the knock-outs are round, but because of the lens distortion they start to look elongated. Thanks for pointing out this stuff though I'll try to fix some of it I think, like that…