I’d just do this in 5 separate lofts. The ‘fillet’ bits look cleanest with the Refit setting in Loft, .1.
My guess is the problem lies in the little ‘fillet’ curves - they do not combine very well. I made a script,
currently Windows only I’m afraid, for making clean ‘fillets’ between non co-planar curves - with those, the joined version lofts cleanly, Though, I’d still be inclined to make separate surfaces.
FilletNonPlanar, here -http://wiki.mcneel.com/people/pascalgolay I’ll see if I can Pythonize it for use on the mac.
-Pascal