There is a problem using prototype dimensions too. I note that steam drawings leave out the lagging quite often, resulting in skinny model boilers.
The PA is a special case - the real PA has a tapered nose, but the Alco drawings show a blunt nose, much like the CLW etched PA kit has.
For an absolutely correct PA, look at Key or (gasp) Lionel!
Get Roger Lewis to tell you about our "nose" discussion at an ancient OSW.
