Humble Opionion:
On private farm roads, private road in a forrest, OK, if you own it, or have permission to enter same to avoid trespassing.
On a public street, public country road, (Federal, State, County, Town, City or any Municipality, etc.), unfinished Model A without minimum safety features "not" OK as far as deputies, policemen etc. are concerned.
Chances of getting a ticket?
Depends on if neighbors call officials; and/or your location.
One freak accident like a kid run into you on a bicycle & it is bad news.
Life is full of chances -- I have taken my share & what the heck, I still do -- be safe!