Scriptment by James Cameron
Remember the huge legal battle over Spider-man? By the time Marvel and Sony had it figured out, Cameron was out of the picture. The final movie did use some of Cameron’s ideas, however. The genetically altered (rather than radioactive) spider and the organic web-shooters had their origins here.
One fan of this scriptment, Daniele Tomasi, has devoted an entire website to it. SpiderCameron.altervista.org features the scriptment in English and Italian, with commentary and storyboards.