Steel construction is fast and noisy and lots of sparks, very exciting. and there is no room for fussy.  The material allows you to simplify your image. I make a steel rod armature, if it is a small piece I often use long nails welded onto a base plate. Then clad it with random shaped off-cuts of sheet steel.
Recently I have scavenged old steel machinery parts that are from an old municipal dump, they are wonderfully corroded and make for joyful images.
Click on the images below to view full size.