Mashallah a very nice project , and your determination and positive attitude towards this project shows that it will be done the right way .
Original parts for W115 in Pakistan are very rare , if you want them your best bet is to source it from abroad , i am not quit sure of the places of these parts but i will ask my dad as he knows and collects W115 parts .
I will get back to you as soon as i get any lead .
Fahd.