[ByteWelder]

It's built with a Raspberry Pi CM4 and a 5" touch screen. It has about 6 hours of battery life and batteries are replaceable. The keyboard isn't great, but it's functional.

Inspiration and motivation came from Yarh.io, uConsole and various handheld PCs from the past.

Some pictures: https://imgur.com/a/ug10swu

[kjs3]

So they didn't 'design and build a handheld PC', they designed and built a case.