I tried google imaging some pics of what a house looks like at electrical rough in, and there are lots, but none that really illustrate it the way you'd understand it if you saw a house at that stage. Basically, there's no way you're going to use existing coax to get to the basement. I don't think there's such an invention as a fish tape that will follow a line through little holes, over electrical staples, past electrical tape that has all the local wires taped together, around corners, and then through more little holes.
That said, it's not really that hard to get what you want, where you want it. They'll just use cold air returns and tuck wires under baseboards.
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