Where to source better parts?

I’ve made a raffles Tudor build and another 5513 one with parts off of Taobao, and I’m considering making something a little bit closer to gen. Been considering making a ghost 9411 with blue dial or a 79090. I’ve heard a lot about “viet” cases “milk” cases and more, but I have no clue on where to get such cases from, let alone other parts like crystals, bezels, bezel inserts etc. Especially when it comes to making a Tudor submariner (for some reason I just like them more than the Rolex ones 😆)

Would anyone be willing to help me out? And how much should I plan for making a gen-like build? I’ve heard these things can get pretty expensive😬 I really want to make a watch with little to no tell tale signs, preferably on a budget.