I'm making a Lok-n-Roll 50ft boxcar kit and I'm having a bit of a problem identifying parts on the etch:

The four components at top right seem pretty clearly to be the stirrups, and the sixteen at bottom right the steps to go on the car sides to form the ladders. Then I assume the parts marked A are stencil plates, one for each end, and those marked B the platforms that go above the couplers, again one at each end.

Then I'm assuming the four other ladder-like parts, two at top left and two at bottom left, are ladders for the car ends.

Would this be correct so far or do I have some of it wrong?

And what are the parts I've marked C? They don't seem to fit anywhere obvious. Door handles maybe?

Also, looking at the photos below, what I assume are the ladder steps are too wide to fit snugly into the holes in the car sides, as are the stirrups. Do I just exercise a bit of sleight-of-hand to get them to fit, or is something amiss?

The other ladder-like objects are maybe a better fit at the sides, but still don't look quite right there or at the ends:

Any help greatly appreciated.