ACCIDENTAL/DAMAGED CARS BUY/SELL

So I am looking for a car, preferably allion 2003 that has been in an accident, the car is no use but the chasis number and papers can be bought. I want to build a car and thus am looking for these scraps with paper fail if necessary which I can update later. I see many cars in front of the Gulshan Police Station in this state.

Can someone advise where I should look into to get more details on these??