The term "steampunk" means modern or sci-fi tech in a form that resembles the construction techniques common to the Victorian Era. Which means that clockwork replaces electronics and cast-iron and brass replace more modern alloys.
I thought that the actual ''pre-quel" should have featured a "Mark 1" version of the Darth Vader we all know and love as opposed to the finished look we see in the actual trilogy. Something like this would've been neat.
I think its been resolved but just to point out in case of any further confusion, Caveatscoti was kind enough to grant me permission to use his superb artwork as a basis for me to create this 3D model from it for a competition on the CGS website. his original can be found here [link]