Hi here! You do find that it has that neon wave look already? That's so cool! Because if it emits that wave now, then it will definitely scream this wave in the end with the final assets ;)!
I will decorate those buildings with neons, I prefer neons over holograms to light up the scene and give it the cyberpunk wave. It recalls those old 80s sci fi jap animes : cowboy bebop, akira, evangelion and all that, and sci fi jap animes are my main reference souces ;)!
About the sound now, of course I'll need help, because I'm not a sound designer at all, even though I like to work with sound in UE4. I already have some ideas in mind for the car sound and for the music. Let's talk about it in discord. You are J. right? I think I've added you as Friend.