Here are some shots of the engine itself:
Front: (note lack of rivet detail...)
Side view(s). Note those large rivets are not embossed; they are "pins" of some sort...
I might mention the domes, stack, handrails etc., are all held in place with small screws and nuts (2-56(?) I think).
Chassis:
Trailing truck: rather rough casting.
Lemme know what you think.
Mark in Oregon