Hey everyone, intel352 here, I'm the developer that created the Variant Chart for Padraic's clients,
Discussed in this thread
I've now finished up a packaged version of the module, available for purchase. I've got screenshots and info here:
http://forum.x-cart.com/showthread.php?p=206012
If you have any questions, please post in the thread that I just linked to
Cheers!