I do not physically break apart my models, but my method is very similar to the one in the link posted above. (the head example at the bottom)
What I do to maintain scale, is that every time I add UV coordinates, I make the UV gizmo the same size (using 3dsMax) Then when everything is done, I re-arrange or scale everything together to fit into the image. This keeps proportions equal for everything.
What I do to maintain scale, is that every time I add UV coordinates, I make the UV gizmo the same size (using 3dsMax) Then when everything is done, I re-arrange or scale everything together to fit into the image. This keeps proportions equal for everything.