This is a case to hold an iPhone which acts as a futuristic advertising board, for games such as Infinity or Warhammer 40k
Print the parts you need, normal and flipped. Glue the top and bottom together and slide over the phone.
Supports are not required.
There are a ton of things you could attach it to and a ton of different clips so I've left this clear and blank on the back so you can add any attachment you require.
There is also a solid half which you can use to resize and cut a hole in for a different phone.