I'd honestly love to see the PCB. Using an LLM for a mostly geometric task like PCB layout feels like using a hammer to cook a chicken, unless KiCAD has some kind of text-based description language i'm not aware of that gets around having to specify coordinates.
KiCad schematic and board files are all text based with a fairly strict grammar, so you would be able to feed it directly into an LLM. Not that that means the LLM could actually make sense of it. Never tried though XD