Hey Crowella !
It's not my ideal sequel to GR mostly because I admit I take more fun and pride in making content
Yeah I'm like you on this, the creation process in everything is so satisfying. And as artists it's nice to add our touch to a world.
GR is heavily moddable too, Circuit Superstars not at all at the moment but maybe later ?
Fun little side fact, they took a lot of inspiration from a lot of us here, one of the devs got in touch with me personally to ask about some tips on environment creation, which I thought was pretty neat

they did use GR to test track designs

That's really cool to hear, congrats Crowella ! Yes they told us on Discord that GR brings them a lot, and they played it years ago. We can retrieve one of Alberto Mastretta's track on the GR Database, he confirmed it was him who made it and the track's name was inspired by one of James Bond movies.
They're also responsible of Mastretta mexican car's line (more from their parents though). So they know their stuff about cars and racing.
Great and lovely developers, very kind communication between devs and players, one of the best community out there, great game. Hope they'll succeed.