Now, don't go "Oh no, another noob wanting buildable vehicles again".Cause this is different.
What if you had a "_____ Building" (____ replaced by car, boat, plane or heli) tool where when you clicked, it made a half-transparent box around you where you could build your vehicles. If it was a car, it would have to have at least 2 wheel& tire (different tire profiles, depths, grippyness, etc.)combinations(To allow for bikes) and an engine (V4, V6, V8, V10, V12).
Planes would need at least 1 engine(varying from prop,rotary prop and the jet.)If it was using a prop engine, it would need 1 propeller per engine. The more engines, the faster.(Unless you get 1 huge boner one.)
You should also be able to put thrust vectoring in if using 2 jet engines.Thrust vectoring will make the plane more maneuverable.There should also be tail fin bricks of varying styles and sizes.They should make the plane more stable.
Boats would need a rudder, and engine(of hydro jet and prop)Prop engines need a propeller (No stuff, Sherlock).
Also, depending on the tool depends on the build box size. If a plane builder, 64x48 ( so you can have a plane that doesn't look to short) Land vehicles can have 16x32 (to allow for big trucks) and boats 16x48 (for big shipping boats)
I think I've said enough.Your thoughts?