Hi Lemo, I see - yes if you need to create a large number of these things it will take a while.

Since you have Rhino you may want to use Rhino's Rebuild command on your offset curve to reconstruct them with a single smooth curve, you will need to use a lot of points to make the new curve follow along your original though.

There is usually not any single super-easy "one button push" type solution to making a loft between many different pieces with different numbers of segments and corners in them work very well. It will usually require some manual tuning and even possibly working with smaller pieces at a time.

If you want to post some more examples of problems you're running into I may be able to give you some additional tips.

But a complex model made up of 50 different pieces, each of which lofts through mutli-segment curves.... I'm sorry but it is just normal that it will take many hours of work to produce such a model...

- Michael