Hi AXLCMT... I just saw your post and thought I'd give you at least a range of cost for me to paint it. I'll let people I've painted for talk about what they think.
If you've read through the first page of the thread I started, you will have an idea of some of the pro's and con's of both methods... so I won't go there. Also, I have done a couple of murals for people who have found 365nm UV strip lights, which will be much easier than tube black lights to install in crown moulding... so that shouldn't be much of an issue.
OK, let me just say that you have a pretty good size ceiling that you want painted, so the price range that I will post will be more than most of the ceilings I do. And, I am posting a range, because I have been asked not to bid murals on here, but I would hope this would be considered general information. For a ceiling of that size... you would be looking at between $5500 - $6800 for a painted mural. It would include probably 8000 to 10,000 stars, the Milky Way, and then shooting star(s) and crescent moon, if you wanted. You would also have a more realistic experience, but then again there are con's to a painted ceiling versus fiber optics.
I hope that helps, at least for the cost. I have not idea of the time needed to do a mural of that size with fiber optics, or how many strands you'd feel like drilling for and then installing. A mural of that size would take me between 10 and 15 hours probably... along with a bottle of Ibuprofen and a few days of recovery in a hot tub and/or traction. :-)
Hopefully others can fill you in on their experiences in both a painted mural and a fiber optic mural.