dude its all on the youtube video
https://pastebin.com/WKwUivdnFrom the maker on reddit on budget
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You can get baseline immunity going for pretty cheap, all you need is Soul Rippers (which probably won't be cheap now - before the video they were 2 ex ea). But even almost minmaxed build shouldnt be that expensive compared to other builds - I bought my bow for 35 ex and amulet also 35 ex and they are pretty much BIS. I'm gonna copy reply from youtube:
Most exalts I spent was divining Soul Rippers to get 3 of them with exact roll (spent like 200 ex woth of divines). 3s voices was 150 ex, 2 aura clusters were 28 ex ea, chest was 1 ex, bow 35 ex, amulet bought for 35 ex, quiver crafted within 4 ex, ring crafted within 3 ex, helmet enchant was 5 ex and then crafting rest on it was like 5 ex, Shackles were 70c, watchers eye was 7 ex. I also spent like 100 ex Divining Timeless jewels. Rest is cheap