Update on routing my house: the first cat7 run through the wall is done!
It wasn't easy because the wall channel has some weird curves apparently, and cat7 is a big chungus, but after three failed attempts and some lubricant we managed to route it all the way.
Speed seems right, we all have 1Gbps NICs and the reported speed is the same as with a direct link to the router. (BTW check out iperf3)
Overall I'm happy to say that this was a huge success!
Linux geeks doing what Linux geeks do...