I'm old enough to have purchased an Open Pandora and seriously considered """"pre-ordering"""" a Dragonbox Pyra. I'm so glad I decided to hold off until launch because well would you look at the time! It's been twelve years.
If you're interested in open handheld devices, the Librem 5 smartphone has its layouts, schematics, assembly drawings and 3D designs published on a free license:
A much simpler alternative is a $25 R36S handheld console (more powerful 4 core cpu, runs both debian and android) and print a different case with a keyboard.
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https://source.puri.sm/Librem5/hw/3D_designs