If I had the files I would share them, but unfortunately that rack pinion design has disappeared into the ether on me. It wouldn’t help you too much anyways because the gears weren’t parametrically designed, so you wouldn’t have been able to scale them up. I’m pretty sure I used a gear generator in Fusion 360 to make the gears, because no one has the time to be designing spur and pinion gears by scratch.
There’s a lot more that goes into the double gear design, and that’s running on custom firmware. I’m actually turning that into a product seen here, so the codebase and mechanics aren’t particularly friendly to work with. You wouldn’t want to use those mechanics for a large table either, because the resolution decreases as the radius gets larger. It’s really well optimized for the small size that I have, but you might have noticeable resolution loss at your table size.
I think the Rack and Pinion mechanics are really what you’ll want for a large table. I haven’t looked at Sisyphus mechanics much, but I think that’s what they use as well.