Dave,
As long as the boiler is as prototypical as possible, especially above the front most drivers, that's all we can ask. I think you know what I was referring to regarding earlier Lionel die-cast steamers with the suspension cast into the superstructure, kind of a horseshoe-monolithic shape.
Am also glad to hear that the boiler will be made out of brass. Although the price point is still an ocher for me, I can see how the model is shaping up to a fine-looking locomotive.
Paul