My initial thoughts of the OP when I first read this thread, and rereading the thread.
With such a heavy frame choice, and very small power I thought maybe the OP was concerned about the legislation for where he lives. Florida states 750W, then theres all that sillyness about classes of ebike
pullin-gs - "#1) Go hard-tail with fat-tire rear tire"
Unless you are riding conditions for a fat tire bike, I'd stay clear of fat bikes especially in Florida because I doubt you will be riding beaches most of the time, or muddy swamp land.
"This build is engineered to be a woods-bike for Florida forest roads and trails. Trails are often loose sand.
I want slow-speed torque offered by this geared motor. Also want fat rear tire.
Dirt bikes (prefered my KLX250, but cant use it)
illegal in FL state and national forest bike trails, and must be plated for forest roads.
Other option is ebike....although will be pressing FL legal e-bike definition a bit."
So yeah I pegged it right from the top didnt I. However, even at 1kw, you'd be illegal because Florida is 750W.
I like the comment on must be plated for forest roads. LOLOLOL Then you want a motorcycle looking ebike with no plates on it.
I like the comment on pressing FL e-bike definition a bit, so you arent a Briton scared of the Bobbies. Aus, NZ seem to be the same. Whats the appetite for ebikes in Florida? Bunch of old people right? Bunch of crazy people right because of the countless Florida Man stories. Isnt there some very loose drinking n driving laws where you can drive a scooter or something. I'd kinda assume Fla is loose but depends on the district I guess, if the donut shop was open or not. Who knows.