In article ,
"Swingman" wrote:

all without the inaccuracies of measuring or
revisiting the site.

I hear that!
I, in effect, take the jobsite back to the shop with me.
Making a full-size template also clues me in on other things--- will
the damn thing make in/out of the house/condo elevator in one piece etc.

There are some advantages to working with projects which occupy 2 out of
3 dimensions only. G