I had a small WIP at another forum, but the site was nuked. There is a lot of masking work, and I painted the upper arms and legs and masked them before attaching the lower parts
The white rings at the shoulders were masked with frisk film; there are small blades you can fit into a compass to cut perfect circles.
Here's an almost-complete shot, but I still have to finish the weapon before I take "studio" shots. The stand is painted silver now.