Experimenting keeps life interesting, even if the state of current technology doesn't support what your trying to achieve. Hmmm, even Tesla had his detractors.
BTW - When mentioning items like HDMI cables that can handle Ethernet, try and find those items on the Lowe's or Best Buy online sites and post links. I would like read about them, but, like many of us, don't have the time to research everything we see posted.
Interesting project, I'm curious to see how far you get.