I will reserve judgment until trial...I can see it now
"Yeah Mr. Skinhead, i'm a skinhead too and I hate Obama. Can you teach me how to shoot?"
"Sure I can"
"Freeze , FBI Agent!"
Seen it too many times where the government "upfront" seems to have a good case but they end up pleading the guys out on much less severe charges because the case is BS.
On a curious note, I wonder how many Occupy types fall under this law. After reading the Florida Law excerpt I imagine you could use it as a catch all to arrest all sorts of Occupy types for teaching others to make a device that can be "capable of causing injury".