[Christ]

If you want to cut a view port, you'll sacrifice some aero (not much), but you can use screening painted black. OSHA determined that screens used to protect machine operators in industry had to be black because everything is in contrast with black to the human eye, and you don't see light, you see contrast. As long as you're not focusing on it, you'll be able to see through the black screen, and screening acts like a smooth surface under high-speed flow.

The potential problem is pressure differential. IF the pressure in the bed area exceeds the pressure above the cap, or vice versa, there will be flow across the screen media.