It is clear the story outline inspired the names Han Solo, Chewbacca, C3PO, and R2D2. Along with the concepts of The Rebel Alliance, The Jedi Council, and the idea of a Galactic Empire. Along with the names Mace Windu, the term padawan, and the political musings more associated with the prequel trilogy. In addition to the final battle on Yavin from the first film.
Lucas then wrote a synopsis for the story, now called The Star Wars. It opens with a battle involving a space fortress being attacked by a group of fighter planes. A princess flees this fortress with the aid of her protector, a sixty year old General named Luke Skywalker. Two bureaucrats also flee, posing as farmers.
It is also evident from this brief description here, Star Wars was intended to be a space age American remake of The Hidden Fortress in the style of Flash Gordon. The Space Fortress is most likely what became The Death Star. Also in the synopsis, the characters encounter several rebel pilots, and Luke defend them in a cantina with a laser sword.