I started off Blocking out the form with very basic shapes such as cylinders, cubes, etc. This helped later steps in ensuring I was maintaining the form while also laying out what the major shapes would be (Base, center box, Phone, Phone holder, etc). Most of the modeling portion was done in 3ds Max: I could've dropped the overall number more but, since this prop contains a lot of cylindrical shapes, I was against doing that and chose to favor quality over performance in that regard.
Achieving the Normal map, I projected each part individually, later using Photoshop to merge them together. From there, I created the needed alphas and exported everything out to Substance Painter. For certain aspects I was going to use smart materials but, this left the prop looking very generic/bland. Instead I chose to make my own smart materials using the preexisting ones as reference. Other than the common channels for a PBR Metal/Rough workflow; I added a opacity, and specular level channel.
1923 King classic metal retro Antique phone