You want to find Spiderman?  Take a look over head. 

ShareCG has one, but not sure if it's a suit for M3 or a character.

http://www.sharecg.com/v/25730/Poser/spider-man

Animotions has a movie spidey for M3 as well as a spiderman texture.  It's in freestuff, under comics, check page 5.

In case you wonder if he's strong, listen bub, he's got radioactive blood!