The task is somewhat related to the discussion on this thread: http://forums.shopify.com/categories/2/posts/31475
I can provide more details, design and examples of the store in progress.
thanks! Wayne - wbremser @ google's mail service.
Been there, done that. aldencosmetics.com
Is non-trivial hacking. Had fun on that one. Used underscore.js for some reason I forget.
Had to mind-meld the other options to play nice too. Fun fun fun... good luck with that one!