Very cool idea.<p>On a technical note, you could define three macros<p><pre><code> \equity{10}{90}
% where the units are percentages, and
\balance{8}{10}
\RandC{8}{10}
% where the units are in mm
</code></pre>
and use this level of abstraction in your source code.
I suggest, the diagrams in a separate column to support the narration,
but with tikz you could even put them inline.<p>These examples should get you started if you want to "program" your graphics:
<a href="http://piratepad.net/GVsgD6x5D3" rel="nofollow">http://piratepad.net/GVsgD6x5D3</a><p>Speaking of power tools for graphics, check out also <a href="http://www.math.ubc.ca/~cass/piscript/" rel="nofollow">http://www.math.ubc.ca/~cass/piscript/</a> and the there-associated book <a href="http://www.math.ubc.ca/~cass/graphics/manual/" rel="nofollow">http://www.math.ubc.ca/~cass/graphics/manual/</a>