-The torp launcher has typically either been green (ST3 and ST5 notably), or not lit at all. The later of which is the majority and since they only ever glowed when the ship fired, it would've been more accurate to just black them out. There's also the red ring around the launcher in a couple of TNG eps that blinked when the ship fired.
-It took 3 years because I didn't care about finishing it. Procrastination 101.
-The bulb on the bottom of the hull was where a deflector pulse came from in one of the DS9 eps so that could be a hint to what it is. Anything else is just a guess since there aren't any canon schematics for it.