"but wouldn't a raised foundation with crawl space be still better? Then you can run your cables wherever you want without worrying about changes - which will certainly come, for example you may not even want a console at some point. "
Nick, you just beat me to it! That's exactly what I would do - forget the PVC cable conduits altogether. All you need is a 6" space and a cable-fishing friendly framing design.
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See?