I have been trying to solve the same issue...
Is there an article to walk me thru these steps needed? I have drawn a 2.5" thick, 6" wide, and 9" long paver brick to be used as a soldier course around the patio, but it keeps getting extruded to 24" long when its saved into my library. So I end up with a 2.5" thick, 6" wide, and 24" long brick.
Thanks for any help you can provide!