Futuristic Citys

Here are some image that I have been using for inspiration odf the city landscape:

Idea

As my design boards are not quite finished yet, so I cant add them onto here, I'm going to try and outline my basic idea.
The game will be set in the year 2020 but as tho it was designed in the 1960's. So it will have that 60's futuristic look to it. For example there cars having like big wings on the back.
It will also be slightly based on the classic Space Invaders game, the way that you will be flying a "ship" around a futuristic city and alien spaceship will be dropping down in front of you, shooting at you. But as well as shooting back and avoiding them, you must also wive your way in and out of the buildings.
The buildings can be shot at and blown up by the aliens, but also by the player, all through the idea is to protect as much as possible of the city.
To get an idea of that the "ships" and the city will look like I will continue my research into what the past thought of the future, mainly what the 1960's view was of the year 2020 as well as even earl yer. For example the film Metropolis was filmed in 1924 and is set in 2000 and shows a very futuristic city landscape.