Please post some pics of the interior as well. Just visit the workshops as mentioned by capsat for suspension work. Shershah would be helpful for many parts as these cars (taxis) have been butchered badly and u can get tons of parts from FAHIM bhai or BAREY BHAYYA.....
If u are low on budget and not changing the engine, then go for modification which give the car both modified as well as stock look.
First of all make the engine 100% with all the cooling system maintained as well as fluids, hose pipes, updated.
Then get the floor done so all the welding & dammar stuff is done. Also if u planning to change the seats it would be done both at the same times.
Then go for suspension, tyres and rims.
Do all the mechanical work done and then go for paint / interior / etc