Here is an Andersen Artisan double hung trimmed out with 5/4 x 6, 1-1/2 x 10, window sill, and Ram's head solid pvc lumber. This is in an 1840ish Greek Revival that has probably been through a few iterations. The various thicknesses create shadow lines that really make the windows pop. Not quite the era you are working with, but another data point on what can be done. (sorry about the sideways photo)
