Hey @CoquiGames -
So Just thought I would make a few suggestions -
For the radar I would suggest look at Elite: Dangerous for the radar bit that @Galeon Suggested. 
Why I suggest it is simple - You can see all enemies regardless of their height difference from you.
This video should explain things in more detail on how the radar in Elite works.
Not sure how feasible it would be from your end. But It might help