The picture of one sitting upside down on top of another in Sloan's book is the best underside picture I have seen of the bolster and draft gear. I don't believe Maxwell had a general arrangement drawing for these cars. I got some of the rest of the flats from him but not these. I drilled the end sills for the crew working on one of them in Chama. I'm sorry, I don't remember who was the team leader. I would suggest going to the Friends page and asking for information there. The car would have had a Chronicler taking pictures besides the crew. They also might have taken measurements of the steel center sill and the bolster and draft gear.