Modelling the Sofa

The sofa in the image below is the sofa which I based my model off of.

The sofa was made from box that I just simply added lines to and extruded. The cushions were just boxes that I used the cloth modifier on. To get the seams on the sofa, I added a turbosmooth to the object at 1 iteration and then added a edit poly modifier on top of it. I then highlighted all the edges where the seam was going to run and extruded the edge outwards and downwards then extruded it again inwards and upwards then added another turbosmooth and set it at 2 iterations.