Im playing with the idea of making a transformer toy from scratch, that is, no repaints, no existing toys, no borrowed parts. Has anyone done this?
One thing I can see being a problem is the making of hinges, joints, swivels and slides. I have looked for a resource online for detailed info on these and their use in transforming toys but I have been unable to find what I need.

Existing toys will be used as a frame of reference (predominately online pics of tf)
The scramble city limb frame might be a good place to start, unless others have a better idea.

Advice and experience welcome