You can look this thread :)
http://moi3d.com/forum/messages.php?webtag=MOI&msg=402.1

Some videos very basic along this thread
http://moi3d.com/forum/index.php?webtag=MOI

And you can see all tuts about nurbs of Rhino, Formz etc...

http://www.rhino3d.com/tutorials.htm
http://www.formz.com/support/tutorials.html
http://www.npowersoftware.com/nurbs/pntutorials.htm
of course that is not exactly same design but you can learn many thing from it!
etc
Have fun Nurbsing :)