The aft funnel is made from aluminum sheet to give it that thin and delicate look. Aluminum is easy to work with but damned difficult to glue. The interior and exterior pipes are all there, the funnel containing something like 30 individual pieces and hollow right down to the main deck. It was probably more work than it warranted but a solid block of wood wouldn’t have answered, no, not at all.
I suspect the forward funnel will be easier to build now that I have a notion how to do it. I’ve already made a boxwood former and plan to start its construction tomorrow.
Additionally, I hope you notice the awning support stanchions with its associated rigging. This was another all-day affair. Many folks choose not to model this detail on their ships but I think it adds to the delicacy of the model, worth the effort in the end.