Hi I am creating a magento website for a Timber company that sell their timber based on the section (width x height) and the length. The client wants the products to appear in a matrix table as opposed to the usual set of 2 drop down boxes.

Here is an image to show what I mean.

Does anyone know of an extension or could anyone put me on the right path as to where I would go to try and achieve this look?

Thank you Glynn