fix autocad 2mm metal sheet (wrong dimensions when bending)

i want to build a product from 2mm metal sheet - i draw it in autocad but when it bends dimensions are wrong,
so what u need to do is make it 3d in autocad or solidworks, and then fix the autocad dimensions

please bid only if u have experience in metal sheet because i think you need to calculate the K factor when bending,

ill pay after i build the product and see if its correct