Decent Tutorials On Advanced Vehicle Blueprints?

Hello!
I’ve followed the Time Attack tutorial that Unreal put up, and that works great! but i’m looking for other things in that vain, i’ve managed to add speed boosts and such from my own knowledge.
But i’m looking for tutorials that would specify Vehicle AI on this blueprint pre-set
and how to change the mesh of the vehicle to something else E.G A Spaceship!
Also, maybe how to add weapons/ammo/health pick ups!
Many Thanks!