While making various sci-fi style maps, I came across the fact that you can make almost everything, except... transport.

In my opinion, a small pack with different tracks, wheels, mechanical legs and hovers would be an important addition to the sci-fi style.

Maybe it's also worth adding steering wheels, gear levers, different types of windshields and seats to this section, so that you can repeat the interior of the car.

This will allow you to easily create maps with your own vehicles, which is as much a part of sci-fi as spaceships.