As a side project, I am attempting to port Gunstar Heroes on the SNES.  I thought it would be quicker to make a port of an existing game than an entirely new game with new graphics, new music, new levels, etc.  Does anybody know where I can find a level map and/or tile set?

Maybe you know it, but Spriters Resource has this one area.

http://www.spriters-resource.com/...

They have sprites and all there too. I'll be curious if this project gets anywhere

Hehe, they put Gunstar Blue in Gunstar Red's palette, and mislabeled him "Gunstar Red."  Earlier this week I found the same sprite sheet on another website, and used it in an animation demo, before I realized it was actually Blue's sprites with Red's color palette.