1) I got some really good feedback from you guys and I agree with most of the comments I received.
2) Size: I think the size is appropriate; its big enough where someone can read it easily but isn't cluttering up the screen.
Placement: I placed all "battle" GUI elements on the bottom of the screen and messages on the top.
Overall Color: The radar definitely needs to change color. The rest of the GUI is using a light, transparent blue and the radar is green. I should make it blue and use that green for the cross in the middle of the radar.
Style: My goal in making this was to create a easy, streamlined interface that looked like it belonged in a Gundam. I think the interface is streamlined and delivers information well but it doesn't look like it belongs in a Gundam. I feel like the interface needs to "glow" more, look more futuristic and pop off the screen more.
3) This was my first time exclusively using vector tools to create something. I used the pen tool to trace a Gundam. I put a stroke around the path and moved on to the other elements. Using the rounded rectangle custom shape tool, I created the entire bottom right box and played with the transparencies, blending options and colors. I made the radar with circles and transparencies and the lock on was more transparent boxes that were altered by playing with the paths.