I started with some simple drawings in Sketchup. This allows me to get the measurements down ahead of time so all I have to do at the table is cut and glue. To my surprise it was incredibly efficient. I have completed two buildings in under a week, and if I did not have school and a new baby, I might have been able to do even more. The pic below is how I lay them out. I draw a floor, then copy and paste it onto the building. That way I can have the measurements down for each floor, and see the building without a bunch of numbers hanging all over it.
|My drawing from Sketchup|
|The back side of the building at the top.|
|The finished building from the Sketchup drawing|