Very useful - many thanks Max! :)

Hi Pilou:
> I have not the "little Lines" of extremities!
Me neither.

> Must I draw them separately ?
I guess so. Max?

> And alas we can't use the Helpers lines for align because of the second click !
Any helper lines can be created immediately after starting script but before first click defining location of dimension arrow head #1.

> Seems Scale inactive! ?
It's activated after 'first click' for arrowhead #1.

Cheers,
Hamish