Insert 3D image into photo background

I have a .max file for a machine which we are building and I would like the 3D graphic to be inserted in the background of 2 images as if the machine is already installed in our factory. I have uploaded angle I would like 3D image inserted into the back of the photos and I will need to separately upload the .max file as it is approximately 140mb.

For an idea of scale, the height of the factory wall in the back of the photo is 9m and the highest point of the machine is 5.5m. If its helpful, I have also uploaded the 2D DWG file.