I have a good friend in Mumbai, India, Amol Yadav, who has built an airplane on the roof of his apartment building. He is a commercial pilot there. He needs specific procedures that US aircraft builders have used to register their planes with the FAA.
Amol has received extensive notoriety for his extraordinary efforts, which are the first of their kind in India. Here is a link to a recent newspaper article.
http://www.thebetterindia.com/49385/...craft-terrace/