I have learned a few things about these cars in the course of doing research for the book. They definitely began life as Reading cars, built by Harlan & Hollingsworth of Wilmington DE. I have some leads on sources of further info on the cars, and may be able to find more info on their original construction. It will be several months before I can get the opportunity to do this research. IF I can get the info, I hope to create a package of info to present to a manufacturer of HO kits to see if he is interested in doing a kit for the car. If he's not interested in doing the AC&Y car, he may still be interested in doing the original RDG version. This would give us the basic car, which could be built with modified sides to represent the AC&Y car. THIS WOULD NOT BE A SHAKE-THE-BOX KIT. One problem is the trucks, which are a very unusual design. As far as I can tell, they have never been available in model form.
I'm wondering if I can get an idea how many AC&Y HO modelers might be interested in buying such a kit. By the way, the kit price would probably be somewhere between $50 and $100 (subject to change). If interested, contact me at firstname.lastname@example.org