About this 3D model
Please consider donating: https://paypal.me/carlosgs I found this great Sketchup design by ALX: http://sketchup.google.com/3dwarehouse/details?mid=112d9018c88671703fdfd6bc6322f73b&prevstart=0 So I exported it to STL, adapted the (approximate) real size scale, and printed the model :)