Central America map puzzle (with tutorial)

Continuing my project of printing puzzle maps of all countries on Earth, this time I printed Central America. I chose it for having few pieces, so I could quickly test the new method I came up with.

I prepared a tutorial explaining how I made the puzzle in case someone wants to design their own. Here it is:
http://myshumi.net/2011/08/29/3d-printable-puzzle-tutorial/

Suggestions are appreciated ^^

South America
http://www.thingiverse.com/thing:11084

Africa
http://www.thingiverse.com/thing:11159

Europe
http://www.thingiverse.com/thing:11216