Here is a pic of my dual 17" portable monitors. They are both 400x250x25mm.
If you guys have suggestions on how to make the ultimate portable monitor, I can pass it over to LUKOS, and if they don't want to do it - I can get the monitors made professionally. I'm always game for better portable monitors
Personally, my dream build is one of those lunchbox type PC cases, with the entire PC and monitor (and keyboard/mouse, maybe) in the same case. No idea if that's realistic, tho.
I'd be interested in basically a big (up to 17") Windows tablet or a lightweight laptop with HDMI input. Doesn't need to have gaming specs on its own, but at least I have simple and portable to use for light tasks while power sockets can't be found.