Beth, I’ve done two MTH Premier 0-8-0’s into the Rutland. As many as the prototype had. If the Imperial means it would have the Premier type switching tender. I’d opt for the 0-8-0. I think it would be a closer model.
On the Rutland lettering scheme. Both Lionel and MTH didn’t get it right on their Steam offerings. The Premier Mikado was one of the very first Proto 2’s. The font is off or the letters are to close to one another. The lettering should be silver as far as the numbers and lettering. The running boards and under the cab should have white stripping. You can find O scale decals at Highball Graphics to view.
