D is the exterior view of a window (actually, an end window...which is 5" narrower than the side windows). "A" shows the otherside of the top. The recess allows the glazing to be inserted. This may or may not be of benefit...but it does make the windows far more time consuming to construct. I don't know how well the mold will tolerate the undercutting...but it should be ok.
"B" is the framing behind the upper pane. "C" is a part "B" with the window frame added.
My current debate is whether to cast the windows as on a thin frame that aligns them, cast them as loose windows to be inserted, or to cast them integral to the interior walls of the car. The first option would be difficult to perform with precision (it would be too thin in between the windows). The third is attractive for assembly and appearance...but requires a more complicated mold. A perk to this third option is that the "B" frames would be unnecessary.
Herman Darr's catalog of plans hasn't yet arrived. It has been a week. I'm looking forward to getting it...especially the Barney & Smith plan (for the roof contours). I am now aware of at least five railroads which operated those cars...one of them was a Cincinnati road! I know of a few additional roads which operated the shorter (and earlier) version.
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