Wait a tick.  There are transformers for free?  As for the live action movie, do you know how many small parts are involved in one single bot?  Hundreds.  For example.  BumbleBee's transformation sequence, when he first reviels himself to the humans, took the entire bank of rendering processors and over... what was it... 50 terabytes of power and memory to do?  Granted, thats a lot of power for just a single transformer, but still.  We could probably do that if we wanted to, to try and make something like that, but thats a little complicated.  

Although, some of the older style animated transformers would definatly work.  Maybe for DAZ or Poser.  Like Cheetor or even the Big Bot himself, Optimus Primal.

In order to go forward, one must often times look to the past.