I'll be retired by 33.

I save 75-80% of my income currently, have plans to build a house within the next year (eco home made with earthbags, very low cost)

Once I remove my housing  costs I will easily save 90%+ of my income.

By 33 I will be financially independent (have enough to never work again) but I will continue working, or i'd get bored.

My plan is to continue til about 40, then Ill have way more money than I need, and I can take up something interesting and expensive like diving without worrying about paying for it.

This is assuming that my x amount of bitcoins do not go up. Even if they stagnate I am on course for this, if they go to $5000 a piece it'd knock at least 2 years off that, I would be financially independent if that alone happened, let alone my savings.