I'm just had an fine idea for a retro-futuristic Space Opera. The story of how Queen Elizabeth came to be irreconcilably at odds with the Spanish Empire, and how that "Invincible" Armada was sent, and how it was spectacularly defeated seemed to fit well the epic mold. Instead of a monarchical ruler, Elizabeth can be the President of Earth. That fits better for Raygun Gothic. In either case she is dignified and just, firm in resolution and dedicated to the good of her people. Francis Drake and his crew will still be in this as Privateers, stealing ships of an alien empire which serves as the dominant power of this setting and primary antagonist. Although motivated by profit, he is not without scruples and a romance between his character and Madam President would not be out of place. I would like advice on how to craft a setting that harkens back to the actual historical events while also being fit for a retro-futuristic space opera.