DIY metal object detecting lawnmower

Had to ask. I kknow you are new here but seriously I did someone to just duct tape a blade on. So Dangerous.
 
Go idea, but I’ll play the devils advocate. Very narrow sensing area, what happens when the metal is outside 3”? Second, would the $$$ make it out of line for a manufacturer to install, thus pricing it out of practical use. Third, do you think there would be a market for the average homeowner to want as an add on? Again, neat idea, but would it be worth the $$$.
 
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