When to flip for a target final heigth?

I have an indoor "custom" grow hut that is 2ft X 2ft X 5ft.
I grew a couple of auto CBD Kush in it for my first time grow and they ended up around 40" tall at harvest which was a perfect size for the hut and me. I am now growing a Feminized Phishwreck that is currently 8" tall on an 18/6 schedule.
Is it possible to get an idea of how tall to let it grow in veg then flip it to 12/12 to achieve a target height of roughly 42" at harvest?
(PS disregard the premature flowering Blueberry Auto in the pic 3 as that's been "commented" on in an earlier post )

Generally they double to triple their height after flip. Just top it or bend it if it stretches to high. Look up “lst”

They generally grow about 30% larger during bloom phase. A good rule of thumb is to flip when they are about 2/3 the size you want them to be at finish.