Somewhere on my list of projects is "Gut a 12" Powerbook and put the guts of a modern M series Macbook in it". The chassis is so spacious and the Macbook Air logic boards are so small, physics is not going to be a problem. Just hooking up screens, the keyboard and trackpad (using the original, natch), and ports. There's already a high-res display swap you can do in that chassis to get to 1400x1050.
I'm very sad this neo macbook thing isn't a replacement for my macbook retina in any way. I'm not really sure what I'll do to replace it; I'd been hoping this "phone chip based macbook" would be of the old retina form factor. But instead it's just a nerfed air. My kids have the macbook airs and my little 2017 retina is substantially dramatically smaller and more portable. At least until the battery dies.