Parametric MakeItFloat 3D Floating Puzzle Assembled With (any) Coins

This is a parametric OpenSCAD version of

MakeItFloat 3D Floating Puzzle Assembled With Coins

http://www.thingiverse.com/thing:924921

All credits of the design should be granted to Omegh.
My contribuition was just to write a parametric version of it
allowing that a model of one module can be generated for coins
with specified dimensions.

Two stl files were generated for pennies and for 10 centavos of brazilian Real.