Did you consider something like the VeeBeam for the video or such? You didn't detail what this will be used for. Gaming over a wireless video link is not acceptable to most due to the delay induced.
As to the wireless keyboards, you have to consider more than the usual due to the distance. Maybe an iPad or such with a remote control app on the pad?
I have a desktop computer in my bedroom that I need to access and control from any room in the house; at the very least, I'd like to access it in the living room (separated by about 4 feet of drywall). Besides running an HDMI cord through the wall from my desktop to my TV, what other options exist? What sort of wireless mouse/keyboard options exist, too, to access this content?