Head: Barrel Roll (BTR)
Torso, crotch and legs: Hi-Tech (VvV)
Arms: Barrel Roll (SpyTroops)
Helmet: (Tunnel Rat SpyTroops Toxo-Viper helmet)
Scrap Iron was a hugely underdeveloped character in my opinion. He's really a pivotal character in my Joeverse and one of the lynchpins tying Destro to Cobra since the Commander hired away M.A.R.S. best designer with an offer of greater pay, independence and the chance to actually test his equipment on civilians.
As a character with a lot of, well, character (questionable though it may be) I wanted him to have a removable helmet. Otherwise I wanted to keep him as close to the original as possible but update him in the new-sculpt style.