>First designs for Trump's border wall with Mexico are unveiled - with bombproof concrete, solar panels and decorative features all on offer
>First designs for a border wall have been released from companies around the country who want to make the president's promise a reality
>But authorities are expecting every stage of construction to be hit by protests - even when they build small prototypes near San Diego
>Bidders are already asking if authorities will protect workers from 'hostile attack' and whether employees will be indemnified for using deadly force
>Chief executive of a general contractor in Fort Worth, Texas, said he has received about a dozen death threats since publicly expressing interest in bidding
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