Order and calculate item by square meter

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Hi,
I'm new to this forum. I'm checking several shop scripts to adopt for a customer. They have a shop where the customer can order some items by square meter. So the customer can pick the item and tell they want 2.5 meter by 3 meter of this item. At the moment, it's just a javaScript page that calculates width by height and puts the price times square meters into the total price field. (yes I know, that ist not a professional method for an order form :oops: but the customer told me to do so because he was on the very tight budget :roll: )

Now I would like to use osCommerce as a base for their new shop software. I want to implement this feature and now I wonder what would be the best way to start with. I would like to contribute the changes, so that future versions of osCommerce can use it.

Any hints are welcome

Marian