Koftgari, How is it done?

[Pukka Bundook]

For a while, I have been wondering how Koft-gari was done.
I know the sort of basics,........Silver/gold hammered onto a roughened background, but was the overlay hammered onto a larger area, then a graver used to shape the overlay into the very fine designs often encountered, or were these fine designs somehow created, and then applied?

I also realise that there are different styles of this work which must be carried out in a somewhat different manner.
Any pointers in the right direction would be greatly appreciated!!

Thank you,
Richard.