Is it worth revisiting a "make out own" type of thing? TLR - Is it possible to have enough people to agree on sticking a single board PC in a case, along with a screen (6 or 7 inches), a battery, and keyboard? With bazillions of projects being done with the raspberry pi 1,2&3 it is definitely possible to make something that fits in a pocket...even if it has to be a large coat pocket- I think I'd setle for that. ... End result- a "standard", pocket fitting, Linux PC that you can walk around with, use anywhere and doesn't cost the earth.