Thanks for the help, Kickaha... I've chosen Inspector-Grid now - - that's great. And you're right, Canada officially adopted the metric system away back when (in the 1970s I think)... I'm used to centigrade for temperature, and kilometres instead of miles, but for the life of me, I can't give up feet and inches. I'll keep trying.
P.S. the Home Design Studio people got back to me to say you have to buy it to try it, but they give you a money-back guarantee in case you don't like it.