Ok...Yes divide into 40ths. Drawing keeps the "wall" part of the model more like a wall and not a grid. Because it is such a major portion of the model I chose to draw out on the back. This leads to the arguement of whether you only want to fold to get the final product or do you want it presentable. Other than that, there are only a few difficult parts. Isolate the difficult parts and work on them using a sheet devoted only to those that give you trouble.