So I think I could change the starting platform/goal/level models/textures(so everyone's games looks unique).

I'm not so good with rocket league ui. So maybe a room with triggers to choose customization options will be good enough.

I already made FancyDuck a duck platform. I can change the colors of the platform/goal/level and the texture of the sky.

Ideas: Wood platform, Rocket league look alike platform(grass, metal, emission, etc...), Skull and bones, anything you can think of.