(Grammar aside, trust me I'm not bright! I do have auto spell though. . .)
Something like this, at this idea stage, would be approx 5300G.
Especially at the drawing phase, you'll never make that 0.4 work!
In my opinion, that's far too much!
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it's just too big!
Only once the actual shell is constructed and the drains are in, you could guess closer, even then, factor in substrate etc, you'll still be out by a few hundred G.
You'd still need to count them buckets in!
All you need is 1/2" of misplaced shuttering, that's going to cost 50-150g, or you'll gain that amount! (. . .and that's not even close! Just a wild guess)
I went from 1052 litres to 794 litres (paper to production)
Last fill 860 litres, substrate is the variable.
That's 277.(908-
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) u.s. gallons down to 210 odd. (According to google calc)
Scale that up! You'll be roughly 500gallons either way!
Really I'm fairly convinced this is just a pile of paper waiting for recycling, I'm not saying it's impossible, I just don't think you're quite ready!
But if you do ACTUALLY have the money and space, recruit some people!
Maybe 2-5 years of planning, you'll be good to go!