If you dare attempt that your fundi will build their own house out of your 'phone supervision.' Mjengo inataka uwe hapo ukimake sure simiti, mawe,msumari,,mchanga,mabati, chuma zimekuja as ordered. And you need to directly source all these through market survey then bargaining. But if you have few cents to burn then go ahead and give the project to a contractor who will take care of everything from scratch, wewe uendeh kifungu after the agreed period