Okay so I have been digging and looking around for other things to make this work. I am pretty set on using a RasPi so I have looked at things for it. However I have never had a Pi and have some questions.
The Pi 3 has WiFi on board right? It is any good reception wise or are break out aerials a good idea?
Some one who has both a Pi and a Steam Controller (@kat ?) can you wonderful people try something out for me? I intend to use the Steam Controller as a replacement for a mouse as a mouse is just plain too conventional, unfortunately Steam does not work on the Pi so no controller, but wait https://github.com/ynsta/steamcontroller a stand alone Steam Controller driver that just runs either a mouse/keyboard or x360 controller. I only want to mouse one, can someone test it for me?
Battery power? I would like to end up making a case for the keyboard/Pi housing and incorporating batteries, 18650s possibly, with the ability to recharge them would be great. Would the power consumption of an iPad screen, Pi with Wifi say watching youtube, steam controller wireless dongle and mechanical keyboard for what ever that adds if anything actually be feasible to run off a pack of batteries?
Basically this will influence the shape of the case that it ends up in, if batteries are out then I can make a smaller case and run off plug power, but it would be super nice to have the batteries.
On to the things I found, screens, I plan to use an iPad screen but I found this screen:
http://www.aliexpress.com/item/10-1-Inch-1920x1200-IPS-10-Points-Capacitive-Touch-Display-Screen-LCD-Module-HMDI-Portable-Raspberry/32707476010.html?spm=2114.01010208.3.346.ZSizfA&ws_ab_test=searchweb201556_0,searchweb201602_5_10057_10056_10037_10055_10054_301_10059_10058_10032_10017_10060_10061_10052_414_10062_10053_413_10050_10051,searchweb201603_1&btsid=781e4127-4024-49b6-8508-d75f5faeb456
10.1inch, touch, and IPS with a good resolution. Would be nice and is cheaper by a tiny bit than the iPad screen and had touch. Win win, Looks good for me.
I found a HDMI version of the iPad screen but in a housing and with out touch:
http://www.aliexpress.com/item/9-7-Inch-2048x1536-IPS-2K-Retina-Displayer-Screen-LCD-Module-Acrylic-Case-HMDI-Portable-Raspberry/32674549776.html?spm=2114.10010108.1000013.4.YZzSXp&scm=1007.13339.33317.0&pvid=5f6f71e2-3734-4b23-a497-7b455c9d1b42&tpp=1
I might actually end up buying these for my PC to go with my other iPad screen, more screens is more better.
Also found this groovy thing but I am not sure I need it or want it currently, but might be useful in the future.
http://www.aliexpress.com/store/product/X200-Multi-Function-Expansion-Board-Adapter-Set-for-Raspberry-Pi-Model-B/1048722_32213389990.html
So this goes on, more suggestions and help if you will.