Even though my papercraft Advance Wars models are all drawn by hand, I always like to add part numbers, glueing guides and things like that to the templates in Photoshop.It also gives me the opportunity to properly rotate and align all the parts, so that I can place them next to each other as much as possible;
In the hand drawn version, I always leave plenty of room between the parts just to be sure, because I often don't know exactly how big the parts will be, and you don't want to have the parts end up overlapping each other of course! ;o)
Another bonus of using a computer program to lay out the final templates properly, is that you don't have to draw symmetrical parts twice: you can simply copy and mirror them, which is a lot faster! ;o)

