Textures 

Textures in this model work as masks, which means there is no need to change the paint colour in image editor (although a "empty" texture is provided for custom painting), it can be done directly in material nodes.
Paint and dirt colours can be changed in "paint" material nodes - mixing is controlled by "paint_diffuse.png" texture.
Windshield shade and dirt colours can be changed in "glass" material nodes - mixing is controlled by "glass_transp.png" texture.
Tyres shade and dirt colours can be changed in "tyre" material nodes - mixing is controlled by "tires_mask.png" texture. 

Moving the model and parts 

The whole model is easy to move/rotate by selecting either the "Lada_Niva" group or the "chassis01" object, which is the root parent.
Front wheels turn can be modified by rotating the "steering_R01" object along its local Y axis - the opposite wheel and appropriate suspensions part will change orientation automatically.
Moving the "axle_F01" and "axle_B01" objects will affect springs' shape and driveshafts orientation.
Trunk can be opened by rotating the "chassis_trunk01" object along its local Y axis.
Doors can be opened by rotating the "chassis_door_L01" and "chassis_door_R02" objects along their local Z axes.