It took approximately one week. I had to spend all night long for that, but I really enjoyed it. Actrually, there was nothing hard to model. As you can see,every objects look so simple. Just a lot of simple objects I had to model.
Many objects are irregular.
First I model objects in regular way, then modify them with the MAX modifier such as 'FFD', 'Noise', 'Bend and 'Edit Mesh'. Actually, I made almost texture on my own. I composite several different texture sources with Photoshop or make a new one with 4D Paint. You can see how to make them on my tutorial here . Yes, sometimes, but I prefer to use ishani's material plugins for diffuse maps called, 'IMS Frenetic' and 'IMS Stratus'.