Custom Order Management System developed using WordPress

Description

I am in the need of a logistics-related order management system developed using WordPress and generally available plugins. I have attached a list of essential requirements to this so please read it very carefully before submitting any proposals or asking questions. As mentioned in that document, I only need to get the basic structure/skeleton of the system ready and ideally needed this to be completed within 2 to 3 weeks.
Preference is given to UK-based developers but happy to consider developers in other time-zones, as long as they have a proven track record in WordPress, custom post types and fields.
Please feel free to ask questions should you need any further clarifications.