No, there wasn't.
David Popp used most of the same techniques to build that as he did on other projects for the layout, so it was never documented.
David used an Atlas Model RR. Co. Middlesex Manufacturing Co. kit, a City Classics Smallman Street Warehouse kit, and a Walthers American Hardware Supply kit to build the structure.
Eric
Was there a magazine article or video on how the large Atlas Supply building on the Tar Branch was kitbashed or assembled?
Thanks