[Nesting limit reached]
Your project looks interesting.   I don't play racing games very often because I suck at them, and people that have far more time to get good at them than I do tend to stomp all over me.    I do love procedural generation though and am definitely familiar with voronoi cells, though I have not coded those.   They do some cool things though so I may have to.  I've messed with perlin noise quite a bit, and I've been known to do quite a few weird voxel side projects.    I love love love procedural stuff.   I think it is critical to making games that we the developers can play and enjoy after we make them.   If we make fixed levels, then we've memorized them likely played them far more than we wanted to during testing, so while it is a game type we WOULD play it ends up being something we don't enjoy playing.   I like procedural techniques because they can eliminate this.   They can make testing a lot more difficult though.    "It did this weird bug"   "what map seed were you using"   "I don't know"  :)