George, consider, a chimney is more than just a straight cylinder. There is usually a taper commensurate to height, a foundation of sorts and in early 1900's some fancy brick work. Plus they emit smoke.
Well, I got this from Harry Hieki that is all the above and quite reasonable. 856 625 5506
The track is on an incline, the pictures are straight
It is 20" tall which IMO is a realistic height and will not over power the layout.