So, the main idea is you battle other people online with a spaceship. Sounds bad? Well, here's a twist: you build your own spaceship. Like, you can make it a spaceship of your dreams. The idea is that you build your own type of spaceship out of "Blocks" (let me get some pics), each block serving a different purpose. Let me give you some pics.
So, some examples of block types:
Empty Block:

roosterpit:

Crew Block:

Engine:

Cargo Blocks can hold air and ammo.
Cargo:

Fuel Tanks hold fuel.
Fuel Tank:

Empty Blocks can also carry fuel, ammo, and air across them from a cargo block to the block that needs a supply.
Fuel Pipe:

Ammo:

Air pipe:

Don't forget to attack your enemy! There's guns!
Gun:

Turret:

So, I hope you get a main idea. Remember, this is just a basic idea, and each of these blocks can be changed a little (Like upgrade cargo block to hold more stuff, more guns, lasers, etc).
Should I improve on this idea? I mean if a lot of people like it, my dad will be willing to code this!