It is not clear How bad the damage was from what you have stated..
You talk about the doors not correctly fitting, etc.... is that after repairs???
Volvo's pride themselves on collasping and thereby reducing energy transfer to the occupants. If hit hard enough, you need the frame and the power train checked for damage/misalignment (by a top notch repair shop).
Hit in the back: Also, Very carefully check the tailgate gasket is sealing properly..any misalignment or incorrect gasket compression will allow exhaust gases into the back of the car.