WooCommerce WP Widget Modification

Hi, this is a pretty simple project to describe. WooCommerce (a free eCommerce WordPress plugin from WooThemes) has a built-in widget called Layered Navigation. You can see a bit of detail about it here: [login to view URL] You can also download the WooCommerce plugin and test it out yourself (there are free themes for you to test). Here's the project: Under : WP 3.8 and Woocommerce 2.0.20 My products (shoes) are using variations for size, and I want to use the layered nav ([login to view URL]) to show the products with corresponding sizes "in stock" By default, the layered nav shows products even if they are out of stock. I need a better way for customers to find what is available in certain sizes without visiting a ton of different pages. The deliverable for this project is a modified widget only showing "in stock" product variations. I can't allow you access to my store as a testing environment or my server. You will need to set up your own installation of WooCommerce on your server, I will send you plugin and licence. When project finished you will send me the modified files. Please don't submit a copy and paste bid. Give me some indication that you can do this outside of the fact that you have worked with php or wordpress for ecommerce before. Thanks!