Thank you so much for your help chaps, it is really amazing to see how Sketchup has been redefined as a program, the organic modelling is exactly what we need!!
The examples is the thread suggested by baz really give a newbie like me a great idea of how the proxy shape guides Artisan to create the curves...very, very interesting.
We will keep on learning the hard modelling side so we have understanding and flexibility to create the proxy's we need, thanks again, you have all been very helpful.