https://makerplane.org/

(not a plane) https://www.youtube.com/@Ground-Effect/videos

Trains - not so hard, it's getting legit real track time that's the issue - and you can always 'cheat' with a Hi Rail Pickup Truck modification.

Automobiles - .. you are kidding, right? You've never built (or met a builder of) a road certified car, truck, or other vehicle?