This kind of alteration really interests me as I kind of dig the Grindhouse project and other such things (I love Tarantino, Rodriguez and Zombie too).

Might I suggest, for inspiration if you still need some, the music video for The Black Keys' 'Howlin' For You' and if you can get your hands on either the Shock Festival DVD or Companion Book. I have both and once I've improved my skills I might try my hand at a project like this for fun (not with Doom, some other film).

Having said that I really like the new titles and the processing on the picture. I will keep following any updates you post here (despite not really being an active participant around here these days I do follow certain threads with interest :)).