Spigen back plate for iphone 5 slim armour

here we have a back plate for the Spigen slim armour for iphone 5(S)
Gurtrude the i3 is only 3 weeks old so i'm still trying to get a handle on what she can do. i thought it was about time to start get a bit more ambitious which is how i came up with this thing.
I have modelled it in inventor (which are the .ipt files) and have attached both a plain cover (spigen case) if you want to do your own thang, as well as the swanky looking one (spigen case assembly)
the cool looking one took 3 hou