I played the GTA SA Zombie Apocalypse mod on the internet, using the Multi-Theft Auto SA Client... it was really cool, the programmer who created the server I played on applied a Resident Evil theme to the game, changing the music to the motion picture soundtrack of the RE film. That was awesome. My idea is to change the Zombie Apocalypse mod into a PLANET TERROR mod, by changing GTA SA's user tracks to mp3s from film's soundtrack. I recently downloaded it using a bit-torrent client, the soundtrack is amazing! I love it.
Also, to make the game more like the movie, I could edit the NPC Pedestrian skins to look more like the main characters--El Wray, Cherry Darling, Sheriff Hague, Dr. William Block, Dr. Dakota Block, J.T., Lt. Muldoon, etc. This could be really cool because GTA SA has a comedic vibe to the game, and Planet Terror is hilarious as well, both are satires. It would be a nice fit, in my opinion.