Thorakites:
Polemarch's 28mm figure is a good representation of this type:
picture
Take what Jeff has to say about thureophoroi on his site:
link
..and add mail. As you say, in the East, mail cuirasses (lorica hamata, to the Romans) may well not have had the shoulder reinforcement typical of Gallic mail shirts adopted by the Italians.
With luck, Jeff will be along to elucidate on thorakitai.
Extraordinarii:
"Very nice indeed but then I came across this on the web"
Nononononononono. Computer games seem to "require" visually distinct imagery for their troop types (in many cases, insisting on distinctions bwteen types that did not occur in history). Totally made-up !
Extraordinarii were simply the best troops picked from the allies that accompanied Republican Roman legions. Not a lot of evidence of full scale cuirasses (Lorica squamata, as the Romans later called it) at this time; bits and pieces reinforcing other armor types: yes, some.
Do we *know* what those allied alae ("wings", equivalent to legions) looked like?
<crickets chirping>
OK, so how would we know what extraordinarii looked like?
<crickets chirping>
Aventine may push the envelope a little bit on combinations of armor types, but they are definitely appealing. Use those as examples if you need to. Just as simple to use a basic Roman, or Etruscan (some of your hoplites could work), or Oscan armored figure, and make sure they have lots of feathers on their helmets because they're "special".
For example, some of these:
link
And yes, they're your figures. With the extraordinarii, if you do something reasonable, nobody can say you're wrong.
Allen