I might just ask those on the lounge . . . Though frankly I'm scared to. Because i ssupect the answer to them both will be somethign along the lines of "They're just deatils to paint whatever way YOU choose! THis is all fantasy, right?" or soem equally jejeune response.
Though the stacks on the Spartan Chinese do have that radiator look on the top, but at least the tops are angled to suggest they are exhausts . . . .