As to the budget, I'm not sure what sort of money would be needed. You have the ash and the mist, which would probably be easy enough to do now that I think about it. And then you have the actual Allomancy, very few of which would require computer-generated effects (Atium, and Seekers--I can't remember the metal's name). I think that the city of Luthadel would have to be computer generated (like what they did with Hogwarts), and have all the different sections filmed in existing places. There's the inquisitors, which could probably be done with prosthetics and fake tattooing. BUt besides that, I think a lot of it can be done with wires and pulleys and greeen screen.
As to what sort of budget Pallopa is capable of, I don't know. It would really depend on the Producers, I think (if my understanding of the film industry is right...which it probably isn't).
My understanding is that one studio develops the script and another does the actual filming, usually a much bigger studio.
Haha, you say all that stuff like it's easy when it's decidedly
not. All of that takes millions of dollars to make happen at all, let alone well.