DO NOT CUT A 75mm CHASE HORIZONTALLY INTO A SOILD WALL.
horizontal chases must be kept reasonablly shallow to avoid seriously weakinging the wall. I'm not sure what the exact limits are but I would try to avoid going any deeper than plaster depth.
horizontally from a fitting is a safe zone so as long as there is at least one fitting on each wall there is no need for deep burial or special protection.
that is what i did when i built my house, and if you leave a small amount of slack cable between each upright stud if you need to add another socket, cut hole at same level as other sockets, reach into wall and grab cable and pull slack out of hole,and with power off obviously, cut cable and fit socket to wall using drylining box
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