Watch out for liability---if you build a mailbox designed to cause harm it can cause legal problems later.
On the other hand if you just design a mailbox to be "pretty" and it accidentally causes harm---no intent shown you are usually in a much better legal place...
I had a friend in the country where they would run over your mailbox if they couldn't bash it. Well he made a base for it so if it got knocked down he could just lift it up again. Well the base also would tip up, dig into the ground and rip anything off the undercarriage of a vehicle running it over that it could. Much easier to figure out who was doing it as they were getting new brake lines, electrical work and muffler installed...
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Thomas
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