Updating this old thread as I love Twin Otters! I just received an email from Kjetil and understand that he cancelled the project. He added that no plans are available.

If anyone knows of anyone kitting a 100 inch to 130 inch DHC-6 Twin Otter, please post here. I flew a 100 inch span version a decade or so ago in Northern Idaho and it was one of the best flying and fun RC Models. Great way to enter flying twins.