Just need the right maps and enough commitment.
It's true. If you're having trouble, finding things even with the maps, I'd recommend just doing a casual playthrough until you kill Doviculus. Then you unlock The Occulus of the Lost, which will help you find everything.
My guess is it's one of the dev's wife, girlfriend, daughter, sister, etc. Something like that. Devs like to give themselves little nods like that. For example, the picture of Jack and his parents in BioShock is a picture of one of the devs posing with his folks. If you walk me through how to find it in my game, I could take a closer look if you'd like. But I don't know if I can tell you much more than I already did.
I've seen it in action and I got to say, it's a thing of beauty.
This is an AWESOME idea. And we're talking an independent third party who makes a mod apart from the game, as it is, I think it could definitely be done. Given you find a modding team with enough time, money, and passion. But if you mean added TO the game as an addition to what's already there, I can safely say as a game design major that it just isn't feasible. The game's already full to bursting with stuff as it is. So much so that digital copies actually present quite a few risks error wise. But I find myself quite enthralled by the concept in general. Let me know if this goes anywhere though. I'd be interested in seeing how it would turn out.
Yeah. I hate to give to the obvious answer. But I really do get all the information I put on here by playing the game. I still firmly believe that it's not required to own and play the game to understand and/or appreciate it. But sometimes the fastest way to get the answers you want is just to play the game. Then you set the parameters and can be as specific as you want in your pursuit of knowledge. I'd recommend trying to do a 100% run at some point to make sure you don't miss anything. Also if it helps, I think Tim Schafer is on social media and does interviews. He and Jack Black have actually been kicking around the idea of Brütal Legend 2 for a while now. I think it's really gonna happen at some point.