@emsenn @ajroach42 @djsundog I did just find that the CHIP design is being manufactured again: https://popcorncomputer.com/
the cool thing is it has onboard battery charging (with charge level visible to the OS which is super hard to get with the PI) plus enough pins to drive a super-cheap LCD; the pocketchip used it with a PSP display which are a dime a dozen on ebay.
basically designed from the ground up for the handheld use-case, whereas with the pi there are a lot of awkward missing bits.