1. place a 10x10 sheet of power cap blocks.
2. place a 50x50 sheet of hull (any colour) to cover it up. Make sure that you have at least one block of space between the hull and the power cap sheets.
3. Look at the ship from about 5-10km away. You will be able to vaguely see the power cap blocks even though the hull is covering them. At close up this doesn't happen.