Yes, the AM roofs are separate. I have yet to do one myself, but I have the undecorated cars (8 of them) and decals. I am waiting on the roofs, vents and battery boxes form Bill. In my last communication with him he mentioned that the caster he uses won’t get to the roofs for some time. That, I would hope, stills leaves the door opened for more orders. My suggestion is to get in touch with Bill ASAP regarding the roofs. The battery boxes and vents, Bill makes using 3D printing so they shouldn’t be a problem in the future. AM has plenty on undecorated heavyweights – sets as well as individual coaches – but get the roofs lined up first.
I remember seeing Santa at North Hills station, though I’m going to guess a bit earlier than 1957. My memory of the event is vague, so I’m thinking something like 1953. If there had been steam, I’m sure I would remember that.
Happy New Year to all!