Hm, an Orc prisoner might be a little difficult, considering that all of Sharon's bodyguards pretty much have a KOS rule on any members of the Horde, and barely tolerate Sharon himself for just being a High Elf.
They're not very politically correct :P

Though we could never have enough crazed engineers running around. We have an alchemist whose mental state is up for debate, but could use someone to supply us with crazy contraptions :)

Most races can work with the engineers, so you are free to choose which race you want.