My experience with Heljan has been 50/50, so I'll gamble on a preorder. I have a reputation in the Chicagoland area to uphold, anyways. 'As-built' would be correct for ~1933, correct?
On the LMS B-G, I picked mine up by pure chance from a local show some 10 years ago. Been running fine since, so I don't know the issues usually lamented with the model. If Heljan has moved away from the very angry factory that did the 1366, this model should be fine.