The integration of the Golem unit was thought out by Ra5946. It was Ra's idea to use the Fire Giant model and put the Golem texture on it.
The Scorpion King looks like it was originally intended to be an upgrade of the Scorpion Man, but it got taken out before release. I found it while I was modding some files, so I uploaded it. It replaces the artwork of the Egyptian Myth Unit, the Scorpion Man. Enjoy!