Hm, sorry that I say it, but... getting a cheap thing with a good dsiplay, a cpu with about some 100 mhz cycle and enough ram let's me thin at an older smartphone. Ok, building your own machine is a nice training in hard- and software, ok. But all thights I had about building a tablet with raspberry 3 or anything like this did lead me to used tablets at the bay... sorry about this sacrilegic words...