OOPs - this can easily be done using Modify Room > Floor, and importing an image. I used an 100px square with (4 colored 50px areas) and set it to equal 12" x 12".

Emmanuel - your program is great, and the documentation is good - sorry for asking a dumb question;-(. But, I would suggest including an image/example for the purpose of printing a grid floor that can represent the scale.

thanks