Well if you have some friends who are mechanics and deal in auto spare parts + plus you have initially one weeks time and a week time after every three months. I would recommend you to buy an indus corolla with excellent body and weeker engine,suspension etc. It would cost you around 650k and then replace everything from engines, suspension and ac. It would cost around 150k and your weeker parts will traded somewhere around 25-50k so you would be able to make a great car at around 775-800k. And keep additional 100k for further repairs. It would not be wise to use latest cars on rough terrains because they have lower ground clearance plus weaker bodies. For reference of prices you can see thread named "ENGINE PRICES IN PESHAWAR" by our fellow member "KARAKORAM" I was also planning the same thing but I didnt have that much time because of my ACCA studies. So if you have time go for it insha-allah it would be worth it.