boards for high current loads

Hello

I have a number of requests on my desk where customers need some areas of
boards with very thick copper (6 to 12 ounces for some heavy duty current)
and the rest of the board with standard fineline features.

Heavy duty plating ?? double imaging ?? etching through a bunch of copper ?
none are attractive options.
Any and all ideas on alternate processes would be appreciated.

Thanks, Wolfgang

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