Sounds like basically a home-brew Steam Link, any pointers on more information about how it's hooked together?
I rather enjoy my Steam Links, although I'm not sure how much traction they really got - not too long back I picked up a couple more on sale for like $10 a pop...
I think Valve might be moving to a software Steam Link instead of the physical box. You can download the software, also called Steam Link, on Android devices. I think you can also install it on some smart TVs, but I'm not sure.
Steam Link is definitely a good value on sale, but I feel it's still pretty buggy. Often time the desktop will flicker and the controller support is still not great. Definitely doesn't feel as polished as running a console.