The current helicopter rotor hub is a bunch of helicopter blades directly welded to a peg, this should be improved somewhat.
Ideally, it would be somewhat like this.
I think the fenestron's outer structure needs to be more rounded, and it needs engine intakes. Maybe I'm not seeing any, but it dosen't look like there are any, and it needs them.
I think the assault ship would be alot better with open sides, somewhat like a Blackhawk. There dosen't seem to be alot of detail in that area, and open sides would really rock.
The fighter is pretty cool looking, but like Gen. Nick said, the wings need to be first. Firstly, they need to be swept back and they need to be de-blocked and made more aerodynamic. The cannon on the front looks rather absurd, but I'm not sure if this was the point. Making it a turret controlled by a second player would be cool, though.
Finished or not finished, it's still a 'Mod', thus fit for Modification Discussion. A mod dose not cease to be a mod when it is finished.
