Scherzo said: TBH this doesn't look like it would've actually been feasible on N64 hardware. Like the thing kinda gives me Dreamcast vibes. Click to expand... Click to shrink...

It wasn't, at least, not for the original vanilla hardware at first. It was designed for the 64DD, which had an extra 4 MB of RAM to work with (which later just became the Expansion Pak) and 64 MB floppy disk thing (which carts eventually reached that size for a decent price). Later footage of Mother 3 64 doesn't look too different than this early build, maybe a bit more detailed.