Here it is.
My wife gave it to me for christmas. I plan on lighting it and put it on a simple stand. I am going to paint it differently from the other builds i've seen. I keep my child's broken toys that light up and strip the LEDS, switches and wires so i have a box of that junk waiting for me .
The main worry with sharpies is having them run when you hit them with the sealer coat.
But, for something like this, you may be safe. Especially if you put some white (elmers) glue over the fibers after you color them
Good thinking Quaralane, aylmers glue dries clear and will most probably protect the fiber from the sealer.
You could also try to color the tip of the fiber that is right up the LED. I don't know what kind of results you'll get though. A test run would be a good idea.