If you guys have inquiries about the LED project (prices)... all I can do is give you my friend's e-mail address and website. I can't speak for him on how much he would charge others for this product. Sorry I can't be more of help... I'm assuming you can go to his website and see the costs of other models' sidemarkers/tails, and you can get an idea.
I am in no way affiliated with his company. I am merely a purchaser and admirer of his custom work. (his website has LED examples of other makes/models he has done)
contact@clearcorners.com
Clear Corners