If you're ripping open your walls to do it, the difference in cost between 6 and 5e is probably a rounding error, and there's a strong desire to do it once.
Interior walls are simply heavy cut-ed 60x30x1.5mm vertical beams with horizontal ligatures made of flat iron 40x2mm covered with "insulation scotch" for noise reduction purpose. Wood planks are coupled vertically three/four maximum in the garage with a simple bar to hang furniture as a horizontal joint. Skirting and ceiling joint covers permit insertion and remove thank to the interior "female side" of the last wood planks cut-ed out before mount.
It was far more complex than what I consider at start (and I still have to finish many parts) but IMO it's cheap, good-looking and comfortable enough to being worth it. With that any kind of implant can be accessed directly without brake anything and when it's time to repaint it can be done again in the garden/garage instead of cover up anything inside...
These days with the prevalence of wifi that's not even necessary. Very often in a house a couple ceiling mount AP's, a drop to an entertainment center and into the study is about all I was motivated to do in my most recent house.
The cable/telcom providers though are the worse. The standard operation seems to be running a cable around the outside of a house and just punching right through the wall.