Thanks everyone for the comments. The grill I made myself, out of some thick alum and used a dremel to cut it out. Then just sanded and polished it out.
As for the plastics I plan on spraying them a light tan color with some grenade logos on them or like army green with logos. I plan on using the ppg plastic prep them make, my paint rep showed me a plastic mixing cup using that to paint it, and I could get the paint to crack on it. Thanks again for all the kind words everyone, I will be sure to eep this updated.