"However, having said that there is still a definite learning curve... Like for example what you ran into in this case. The learning curve kind of gets magnified if you want to do somewhat more complex curvy shapes, there tends to be more things that can go wrong with that stuff."

Yessss, I tend to want to run before I can walk... However, the learning curve here is not so horrific! I managed a (slightly wobbly) hull, so I'm pretty chuffed.
Is there a way to turn off the lines, apart from picking them out one by one and hitting the hide button?
Cheers
Fraser