I never knew that Steel Machine CD-i was originally a AGA Amiga game by Ocean Software and developed by Zephyr Studio, but it remained unreleased. I wonder if licensing issues were the cause why Steel Machine was eventually never released in USA? How did SPC Vision pick up this title? I always thought Steel Machine was an original title by The Vision Factory. CD-i member AmigaJay about Steel Machine:"This started off as an Amiga game by Ocean software but got cancelled somewhere in production, looks like it got picked up for release and finished by Philips. Although after looking a little closer, on the Amiga demo, it actually states its for AGA (quite why i have no idea!) and it was coded 93-94, as you know the CD-i game came out in 1993, so looks like this was a canned port of the CD-i game."
Zephyr Studio is more related to SPC Vision as you might think. From the same guy who made the concept art of The Apprentice 2: Marvin's Revenge, this guy made more graphics for SPC Vision games including The Apprentice (background graphics), Steel Machine (background graphics) and Uncover: Featuring Tatjana. He did this while working at his own company Zephyr Studio (based in Eindhoven, The Netherlands). Zephyr was hired by SPC Vision to create these graphics. He was also responsible for an unknown (and unreleased) CD-i game named 'Falco & Donjon and The Sword of Inoxybur.
[Thanks, AmigaJay]