That corkscrew is awful for Kumba
![test [lol]](https://www.coastercrazy.com/forums/images/smilies/icon_e_ugeek.gif)
That looks more like a corkscrew on, well, Corkscrew than it does one on a B&M coaster. B&M (and all modern corkscrews, for that matter) have a very distinct shape, and are probably not going to be easy to make in any modeling program that isn't force-based.
However, I most definitely suggest that you use this capability to make an Arrow coaster that kicks ass. Given they were designed using geometry and not force, I can easel see how you could make a nearly perfect Arrow coaster. I'm just worried that modern designs won't turn out as good as you think they will.