Maybe make it just like a real DO?
You know like add these things;
- Another Gate `Hades` with very hard aliens.
- Skill Designs + Working Abilities
- New Ship designs (Veteran/Elite` for AEGIS / CITADEL / SPEARHEAD)
- Saturn Design obtained by Gate
- Fully working rank system?
- Maybe `clans` ?
- Pirate maps

Battleray could be fun :P
- Change the scale of PET (I think its too big :/)
- Possibility of seeing the rockets `jump` as they are in Heat-seeking Missile (PilotPoint Skill)
- Titles? Like `Space Master`, `Space/Orbit Cleaner` , `Undefeated`
- Upgrades; Seprom/Prom
- Improve the letters for the nickname.. it's quite annoying type of style.
Now it's your choice to choose the one's you want to pick out and do.