laptop replacement

I tried a 13" surface pro 9. While I like the touchpad and how smooth it is, I would really like a 16" screen. I absolutely love how I can fold the surface up and use it like a tablet. The keyboard of the surface does feel a little bit more flimsy but a metal keyboard of similar thickness would...

I am currently thinking about building my first thin mini itx build. I have done a mini itx but I really like the idea of the thin mini motherboards. After a bit of research I have found that it may be possible to run the small computer off of a portable power bank. Has any one else done this...