This is so great! It remembers me of all that sci-fi stories i read when i was younger. I remember specially one German story, (Raumpatruille Orion), Space patrol Orion. This could be a cover well applicable to one of these books
Specifically, for this poster, I didn't use any references. This stupid weapons and costumes is my own imagination. But I love silly fiction of the 60th and represent the overall style of things as well.