Honestly I think i could do it with a pretty small budget considering the scope. So still like half a billion cause giant movie trilogies are expensive but that's half a billion for 3 movies. One advantage of the story is you can reuse a lot of sets. I've got a different visual idea for stuff than Jackson but id be an absolute stickler for not doing any production techniques that weren't used in fellowship aside from that fucking cave troll. Glaarung absolutely must be mostly animatronic. My vision style wise is half way between Jodorwoski and Jim Henson with a bit of Terry Gilliam's dirty as hell midevsl look from holy frail and jabbwerwocky but played more straight. Also, no fucking plate armor, Tolkien would be so fucking mad a out that cause its a post Norman conquest thing. I guess The Northman would be a solid stylistic jumping off point as well. My ideas for adapting Tolkien are artsy as fuck, id rather get the vibe across than anything.
My Beren and Luthien adaption is closer to The Leigh of Lethian, basically a film opera.