Is there a specific machined plate model for orc characters (orc race mod from UAP) ? Or do they look like barbarian armor or other type ?

I'm guessing the second answer, but just wana know

Check out the list on Game Banshee. It appears that Large Machine Plate can be fabricated once you find the appropriate schematic and have the intelligence to craft it with associated components.

https://www.gamebanshee.com/cgi-bin/search/banshee_search.pl?_layout=arcanum_items_list&_cgifunction=search&arcanum_items.category=torso

That does not answer my question, and btw orcs don't wear large machined plates but medium (large is for ogres and half ogres)

I found the items id and spawned the item in game, it appears that machined platemails on orcs look almost exactly like regular platemails but with a slight color variation on the waist (lighter red)