Create a Drupal module to show product stocking level at specific warehouse

We are working on a new B2B ecommerce site using Drupal Commerce. We need a way to show "Stock Level" information using data from a custom database. * Custom table 1 "Warehouse" with 2 columns: Warehouse ID (pk), Warehouse Name * Custom table 2 "Inventory" with 3 columns: Warehouse ID (fk), Product SKU (fk, link to commerce_product), Quantity Available (up to 2 decimals) * Create Feed templates for pulling data into custom tables from our backend via CSV * Modify User so they have a "Default Warehouse" * New "block" on Product Display pages should be hidden for anonymous users and for users without a Default Warehouse assigned * Describe stock levels in generic terms, and counting all SKUs together (e.g., "More than 100 in stock", or "Less than 10 in stock", or "Special Order" when not in stock). Display a second line, if applicable, from total quantity available across all warehouses. (e.g. "More than 100 available via carrier"). See screen shot A. * Add a security permission to User Roles to allow certain Roles to change their Warehouse assignment on the fly, including a AJAX call from a Product Display. See screen shot B. * Add a security permission to User Roles to allow certain Roles to view precise numbers *per Product SKU*, including a column for all warehouses . See screen shot C. **IMPORTANT** Please begin your response with the answer to the following question so we know you read this over! What is your favorite car? We have additional modules that will need to be created, so it would be great to find someone who has attention to detail and is good at documenting how it comes together for our internal developers to learn from.