An engine servicing facility for the JGL

[Sumpter250]

Oh, I also want to model a structure on the roof which would house the top of a flight of stairs from below for access to the roof. It would just have a door, could be made of any # of materials I would guess. Any pics I could work from would be great. Could it be shingled with asbestos type shingles used on homes back then, with tarpaper roof, or would it likely be masonry?

My best guess would be: A door, at the top of the stairs, a "roof" paralleling the slope of the staircase, from the top of the door to the roof level, and sides that filled in the open area between. Most likely of the material used in the building, but would more likely be wood frame construction, and most likely cheap, so tar paper over all, sealed with hot tar.
As for the window.......if it is only one, no need for the expense of a powered scaffold, a "boatswains chair", or even just a harness and line tended by a worker on the roof. The securing point might just be a heavy timber, set inside the door of the roof access stair enclosure, or tied around a plumbing vent, or other rooftop structure strong enough to hold the weight of worker and water bucket.

The house I grew up in, had asbestos shingle siding from the mid fifties (Dad and I put it on) to sometime in the early 90's. A 2007 photo (Realtor ad) showed it to have new siding.