Thanks 2ner and neeters_guy, really appreciate your comments!
2ner,
I can't make a lot of comparison between AS and illustrator (I do not use this often and haven't quite mastered in yet). I just find its a lot easier and faster to create curve lines on AS than illustrator's pen tool where it requires adjusting the tangent points (I think that's the name, forgive me if i'm wrong) cause I'm a bit lazy =P.
But I think each program has its own strength and weakness. Based on my opinion, illustrator is more suitable to use in creating non-organic vector images (icons, buildings, phones, cameras etc.) where it usually involves straight line and basic shapes. This is what I think.
neeters_guy,
Not quite sure what you meant by the workspace of the construction lines, is this it? Here's the screenshot.
