Attached is the design offered by my landscape architect. You can see that I have 1140sqf + 86sqf for spa = 1226sqft. The math that I am seeing to calculate the formula is not adding up to what I am being quoted. My math is coming in way higher, but pools I have seen similar size are saying they are using much less than my estimate. I got an estimate from one gunite supplier and seems about 25cuft on the high side.
Obviously I do not want to under order because that can be a nightmare for a job, but I also don't want overage to go to waste either. I will stress no rebound and everything shot solid and I will be breaking ground in 60 days.
One last point. Where you see jumping rocks, will be another waterfall so I will need to gunite under their to prevent leakage.