Homebrew PCBs

Has anyone ever tried to homebrew a flex circuit. It would seem to be a similiar process except for finding copper coated kapton film. I wonder if one could get prelaminated kapton, or if one has to do it themselves. The copper bonding is probably a real pain due to the slipperiness of kapton. I'd like to give it a try, but any pointers would be appreciated.

Thanks
Ron

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