I remember seeing one of these in Chatswood, Sydney, Australia

Generally, this is a really cool project but an extremely poor racing simulator. I think the focus was clearly much more on "let's build something cool" rather than the sim-racing aspect, and they succeeded at that (I love the choice of donor car - it's very charming shrunken down).

The display setup, choice of wheel/pedals, and general ergonomics of the final product are all kind of questionable, and regardless, I'm sure it's still a ton of fun.

I'm sure a v.2 could make a lot of improvements.

The placement of the monitor is also odd, doubly so because it is curved. Most sims will let you render offset from the driver seat (iRacing has keyboard shortcuts to make all these adjustments easily) but the image is being rendered from a "first person" projection a foot to your side. The monitor being tilted isn't ideal either.

If using an actual chassis the best way to go would be with a projector mounted as low as it can be to clear the top of the car, ideally onto a screen that is curved out from the driver's perspective.

I actually see quite a lot of elaborate rigs that go for the trusty Logitech/Thrustmaster belt drive wheels, I guess if you've got it and it's working fine for you then build around what you've got. I on the other hand am terrible for gear acquisition syndrome so I'll skip the impressive car-in-house rig to chase the next upgrade.