As I understand it, FROM DUSK TILL DAWN was Tarantino's first paid screenwriting job. Make-up FX maestro Robert Kurtzman was looking to direct his first movie and had come up with the original FDTD concept. He was introduced to Tarantino via mutual friend Scott Speigel (EVIL DEAD 2 co-writer) who, based on his writing samples, was paid upfront to pen the FDTD script. This enabled Tarantino to quit his day job and concentrate on writing.
The film was going to be done low budget with Joe Pilato in the lead as Seth Gecko. To lure potential investors, Kurtzman shot a brief promotional clip to illustrate what he had in mind. Alas, the project as intended never came to fruition.