I have 18 years in database design, system-to-system interfacing and Access / Excel VBA.
My bid is at the high end of the project budget, but that is due to the fact that I have included, not only the database design, inventory and despatch systems required in your specification, but also an interface between your POS system and the database.
In my work experience you will see that I designed and developed a full logistics system for a UK Bluechip company (Park Group PLC), which included all aspects of the system. This project was completed well within the time scale required.
Examples of my work can be sent on request.