The PDF contains detailed, schematic-style orthographics of nearly every vehicle and location from the first four films. Seeing the inner deck plans of the Nostromo or the cryo-tube layouts in high-res scan form is a goldmine for lore junkies and artists. For someone who just wants to zoom in on airlock details without paying $30+ for the hardcover, it serves a purpose.
What I can offer instead is a that: