A full 1/3 of the kings I find are juveniles under 2.5 feet. Most of the kings I find don't exceed 3.5 feet. My hunting methods do not involve looking for snakes active on the canal bank, though. I almost exclusively hunt artificial cover, though I have found kings out in the open, including one that was less than 3 feet in length. You can generally assume that all these snakes were found under trash/debris, though some were found under large rocks.
Juveniles are known by collectors to be nocturnal, and it's not uncommmon to find them crossing canefield roads at night. I know someone that has found them out in the open on canal banks at night.
I have found kings in the middle of fields right next to Australian pines and oak trees, and not next to any trees at all. In my experience, they inhabit any dry habitat adjacent to the water (canal or lake) as long as there is some sort of cover available, whether it be thick grass or trash. I've not found any live FL Kings outside the canefield region.
No, only a few of those pics were from earlier this year, I only found 6 kings on that trip.