A lot of the compromise is to allow the loco to operate reliably on very sharp curves. The smaller the curve, the more of a butcher job the model is going to be. To my eye, below a curve of about 54" diameter, the "shorty" Hudsons actually look better than the full-sized ones. TOO much overhang!! The amount of add-on detail is a separate consideration. But a skilled modeler can always add piping and lost wax castings.
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