I got my undec '35 coach today (thanks FMV for still gluing it all together

) and after looking at my CGW pictures, I noticed the vestibule doors differ from the model. I thought this might be a CGW thing, but then I looked at the
builders photo of coach 4400 and there looks to be the same door. There also appears to be a plate at the bottom of the door which I assume folds down over the steps.
Assuming that the CGW didn't swap out doors over time, car 200 had three doors like the model and one with the large square window. There's also a picture of car 201 with the square window doors on both ends of one side. The CGW doors look like they might be a dutch door too.
Do any of the MILW books talk about these doors?
Jason