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I want a module developed for OpenCart, so the functionality for a pricing matrix can be easily ported to any OpenCart installation.
What I have so far is a hard coded prototype, the functionality for the front end product you can find here http://cheapbusinesscardsuk.com/desktops/business-cards.html
(Ignore the "customise now or upload your own design buttons, this is part of a web to print system I'm trying get fully integrated).
To understand how it works on the back end, go to http://cheapbusinesscardsuk.com/admin then go to Catalogue>Products>Business Cards>Custom Price.
Unfortunately the code is not documented, so you would have to either rebuild or work out how to merge the code.