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14 1/4" - 14 3/16" = 1/16" Too short can be fixed by making the smokebox longer (it is not a scale loco) too long and you cut a bit more off This is important as if the barrel is made only 14 " long, the throat plate would foul the rear coupled wheels, unless the smokebox was pushed further to the rear or made 1/4" longer and that would require further changes. Jo
I tried to find Alan Stepney's old webpage as he had been collecting "features" on locomotive and model drawings but someone has brought out his URL and it is no longer available
Looks like the length of the boiler tube is the only recognised "feature"