No money down principle mostly work in developed countries where you have all credit facilities at your fingertips, in Nigeria it may be a little difficult to achieve because of the bureaucracy, just say economic probs.
Nothin down or No money down is a term popularise by Robert G. Allen an American enterpreneur per excellence. For about 25 years ago he wrote on how he went about purchasing houses and selling them without money in his pocket.
But you need some level of integrity to do this.
He also wrote something about it in his book, Multiple Streams of Income. I suggest you look for it and buy in any motivational bookshop.
In Nigeria, if you don't mind starting small you could join a cooperative society that targets house building for their members.
http://www.buildingcontractorsecrets.com/bcsfinance.htm