This pdf contains 380 pages on how to design and model a robot in 3DsMax.
But should be able to apply the same tips and tricks in any other 3D package.
It only focuses on design and modelling
It´s hard to cover every step of a model, but tried my best to cover most of it.
Even the mistakes I made during the process.
So you will be able to see some design choices that did not made the final cut, for the - Head, arms and legs.
Next to that it shows how turn wrong design choices in better working design and how to quickly iterate on new fresh designs without getting stuck in the same mindset.
More info and opinions can be found here