Magnetic nesting measuring spoons (customizable)

I liked the design of [kingpop's nesting magnetic measuring spoons](http://www.thingiverse.com/thing:260572), but I already had some [1/8"x1/16" magnets](http://www.amazon.com/gp/product/B0065O63BK) on hand and wanted to use them, so I redrew them in OpenSCAD. There are a few differences to the original:

The spoon bowls nest concentrically.
The bowls are placed with their centers equidistant from the center of the handle, instead of at the end of equal length arms.
The bowl volumes are ma