Add Multiple Products to Cart (project) BigCommerce

We need a simple “add to cart” functionality (Easily Editable BigCommerce Panel) for our BigCommerce Store. Developer must be aware of BigCommerce limitations, as well as familiar with BigCommerce database/template system. Script would be preferred in JavaScript language. Below are a the key features that must be accomplished with the new “Add to Cart”: • Must allow for multiple SKU’s “products” [Product_id] to be added to customer cart on single “add to cart” button from pull down options. • Must allow for buying options to be visible & functional on individually listed products as well as custom pages (could be through called custom “Panels” or even called through “Snippets” for easy implementation/maintenance through website) • Must allow for quantity option for each product SKU [Product_id] • Must allow for variations [ie: color/finish] if applicable to SKU [Product_id] • Must display product image according to selected product [Product_id] on pull down selections. • Must display selected product [Product_id] image according to selected product below main active image on pull down selections. Attached is a sample layout