@ Paul,

Another excellent script here ! It's really cool to have permanent construction lines ! ;-)

@ Michael,

>>> In version 2 I would like to make it possible to lock objects to prevent them from being selected, but remain snappable. At that time you would be able to draw a circle, set it to have a dashed line style, and then lock it and that would end up being the same thing as a construction circle.

Yeah ! Good idea. It's similar to a feature in Illustrator. I'd really like to see your "feature list" for V.2... ;-))