Reason: My character is supposed to be some sort of prodigy/contain nearly-above-humanly-possible-skills when it comes to building things, origami, carpentry, etc. However, as it takes me about a half hour to make one crane (that ends up looking like something else), I have no idea how long a skilled person would take to make just one.
EDIT: Okay! I think I got an idea now. Thanks to everyone that provided input. I really appreciate it!