Thanks guys,
Very effective, the cabin is great, especially the chimney. 
Please do tell how you did the chimney. That really draws the eye and makes the cabin a great piece of eye candy!
The chimney is made from a shaped solid styrofoam core with thin (1.5mm dia.) bamboo skewers glued to it in alternating layers. It's time consuming but I'm pleased with the end result. Once the glues dried I filled the gaps with ready mixed filler (spackle). I let the filler dry for about half an hour, then I tamp it in place with an old, stiff 1" paintbrush.
Great idea on the mud chinking (technical term, that...) between the RMZhorizontal dowel logs! Never considered doing that, but know it is something that was done. I'll have to steal that idea on my next cabin.
Thanks Mike, that was the main thing I picked up on my research. What doesn't show is the timber fillers used to reduce the chink before applying the mud mortar. Once again it's filler/ spackle tamped in place with an old brush. I've also done the inside of the cabin, too. Please feel free to steal the idea ...
Luckily enough there's a lot of details available, especially internal photos showing how the fireplaces work. There are a couple more cabins in production and I've got an idea for a two room cabin similar to the one at the Museum of Immigration in Northern Ireland (my closest refernce source without flying to the states

).
RMZ