so here's a thing........ Anderton boats are renowned for their steep tumblehome on the cabin sides. When Norway was built she was built without gunwhales, which leads us to the issue of what is more important, gunwhales or a wider cabin top. obviously, we opted for gunwhales, this is the only compromise i was willing to accept. Given the dimensions in the Anderton Notebook this makes for a narrow cabin doors bulkhead, and the knock on for a chimney collar. We knew this would be very tight, a 6" collar is a non starter, a 4 1/2" chimney would look wrong, and therefore we opted for a 5" one. We still can't fit a full collar in, so will be welding in a 5" pipe through the cabin top, with a 1 degree turned taper so at least it looks like a collar. This will be sleeved inside the cabin so it resembles a 6" collar. Because of the this the slide runners will be slightly narrower, but overall, I think we will manage to fit it all in just about!