I'm sorry, but I don't think it's currently possible to get a texture to bend around curves in SU without stretching the pixels. There are plenty of times I've wanted a stone pattern to bend around an arch or curved wall while maintaining orientation to the object, but no luck. Best bet would be to manipulate the image in photoshop to bend it and them project it on the model, paint the cladding exactly as you want it to appear, or export the model to a package that supports better UVW manipulation.