No - the bare frames came with plastic sleeves to route the cables through - but then you take them out and save them for when you're going to do a cable replacement. (snip cable at far end, slide sleeve over cable through frame, remove old cable, insert new cable, take sleeve back out). You can kind of see them in my attachment. Once you got the cable in there - no housing or sleeve inside the frame.

The trouble comes if you forget or break a cable. It's a hassle but "dang near impossible" isn't accurate at all. I used a piece of copper wire the one time it happened to me - fishing the wire to the hole took about half an hour.