Bake sheets of gingerbread and stick them together with icing. You can stick other sweets on this way too to decorate. If you want extra stability when building the walls place around a square sponge cake. ( The sides will come up taller) ice cream cones make great rooves for turrets. :-)
The best way to draw a person naked is to have a naked person sitting in front of you. You sould then deal with your subject in exactly the same way you would if he or she was clothed. Draw what you see.