Good afternoon!
I can offer as an idea to create a single mod, or a series of mods as an analogue of the Aircraft mod, but in a "helicopter" version and your high-quality graphics.

1 LEVEL:

"Private"
- Small size
- Light weapons (light machine gun)
- Small inventory
- Small mesh equipment

2 LEVEL:

"Shock"
- Medium size
- Heavy weapons (rockets, heavy machine guns)
- Small inventory
- Small mesh equipment

"Cargo"
- Medium size
- Light weapons (machine gun)
- Large inventory
- Small mesh equipment

3 LEVEL:

"Fortress"
- Big size
- Heavy weapons (rockets, machine guns, cannons, combat drones)
- Large inventory
- A large network of equipment

"Cargo Airship"
- Big size
- Light weapons (light machine gun)
- Large inventory
- A large network of equipment

"Airship - tanker"
- Big size
- Light weapons (light machine gun)
- Large liquid tank
- a large network of equipment

4 LEVEL:

"Space Shuttle" You can try in collaboration with the mod https://mods.factorio.com/mod/nco-SpaceShuttle
- The average size
- Light weapons (light machine gun)
- Large inventory
- Small mesh equipment

You can also think about a more complex option - Balloon defense.

On the basis of conventional turrets, make options hanging in the air that work on the principle of balloons, or fixed airships

2 LEVEL:

"Combat platforms"
- Small size
- Light weapons (machine gun, flamethrower, laser gun)

3 LEVEL:

"Flying Artillery"
- The average size
- Heavy weapons (long-range gun)

You can try to collaborate with the author of the mod https://mods.factorio.com/mod/vtk-cannon-turret