Designing ANSI with graph paper

Hey folks -

I've been speccing out a new door for rubik's cube technique, solution
algorithms, scramblers, etc. And while most of the work is in populating
the database file, I decided to do much of my UI design on graph
paper. Often times, when my mind is on design, I'm not usually in front
of a computer.  

My printer has built-in forms, one of which is graph paper. The squares
are ten-by-eight with each containing small squares in an eight-by-eight
configuration. It seemed rather convenient.

After going over many versions of various screens, it dawned on me tonight
that the columns and rows aren't perfectly square on the screen, but
rather rectangular. I don't know if this is universally the case across
all aspect ratios.

Would it be a fair approximation to design my drawings such that the rows are
one across and two down? Outlining a standard BBS screen would take
eighty-by-fourty-eight squares. 

When I draw a square using line glyphs, for instance, it is five wide
and two down, not counting the corners.

Thanks

D