The Apple Watch is OK, I guess, but a miniaturised Apple II strapped to your wrist? Now that would be cool.
This Instructables project is a complete build for an Apple II-themed smartwatch. You get the authentic beige housing, two whole disk drives to house your magnetic storage disks, and even a not-so-digital crown to navigate the command-line user interface.
The build uses an Arduino board to run a very simplistic software, which completely accurate replicates the functionality of the real Apple watch:
clock - shows a random analogue clock face
fitness - fills up "progress bars" for moving, exercising, and standing
pictures - cycles through a selection of bitmaps
phonebook - displays a list of abbreviated names
weather - shows a photo of Earth
music - slowly animates a flower opening
utility - displays a static photo of a butterfly
disk manager -blinks the disk drive LEDs a couple times
The main case itself was a fairly simple 3D-printing job, with all the relevant files posted online. If you want to make your own, you'll need a 3D printer to call your own, reasonable electronics knowledge, and a decent mullet wig to round things off. [Instructables]