Other than the grossly out of scale pans & details, how out of scale is the shell? The 1B+D+D+B1 wheeel arrangement would be a challenge, though.
Gosh, haven't been to this sight for awhile!! But, yeah-it seems pretty close to the brass one that (I think) Hallmark made years back. That's the only thing I have to judge it by.
Update: I've recently painted this in the Milwaukee's original color black, and re-numbered it. I have some N-scale pantographs coming for it too! Still a static display, but way better looking!