Copper layers of different dimensions inside PCB

Previously, on this forum, I asked a question about having an elevated pedestal (or island) on a PCB, like the image shown here.

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I learned from the responses I got on this fourm that there is no native way to do this in KiCad. (I think KiCad copper layers are all enclosed inbetween masks and silk layers so, in the 3D rendering, it ends up being a rectangular block.

However, after discussing this with a PCB company, they said they could make a board like the conceptual representation image shown here.

However, when I added 2 additional layers in my KiCad PCB file and swapped layers to make the bottom two copper layers In4.Cu and B.Cu, I realized I actually don’t know how to define copper layers shorter and narrower than other layers. If you look at the 2 images I attached here, basically the filled zones are the size that I want In4 and B copper layers to be.

Is there a way I can define copper layers of arbitrary dimensions? (Also, is it possible to assign different copper layer thicknesses?)

The company understands what I want and they know it is doable. It’s just that I want my Gerber files to represent what I would like for my PCB.

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