RE: Twin Otter 125inch wingspan
Anything more than a slight reduction might be a problem as the plane is designed to be 130 or larger ( and a couple people are considering large Twin Otter from enlarged plans) and the weight vs wing area might make the wing loading too high ( bigger flys better) . The plans are on autocad so enlarging or reducing them is not a major problem . Making the nose to whatever shape should cause no major problems as in the model that area is not structural and would require only the reshaping a couple formers and making the shape you desire. I could provide templates if necessary but scaling off the photos, 3 views of the exact plane one wants to duplicate should be quite easy. John