When it comes to a project like this, one made from re-using existing components instead of starting from scratch, it's important to try and figure out what you want to achieve with the basic parts you've collected, before you start cutting and gluing. This particular phone was a lucky choice to use, as it has an aluminium shell, and lot's of separate components, perfect to hack up into bits of transformer "armour"
I had a couple of VERY basic sketches and knew, for example that I wanted to use the phone's keypad as the breastplate for the transformer.
That said, once the basic skeleton was conceived, the rest of the time was spent making bits up as I went along! You'll notice the evolution of the head as the photos progress, he had at least three heads until I settled on one I liked!