Online Ordering system to connect to ERP

Build an online ordering system to connect to our erp. Authentication of users will be done by our wordpress member site. users will have the ablity to track multiple orders per account. Part/sales/configuration tables will be provided. users will create a default configuration per order to apply to parts and have ablity to choose a custom configuration per line item. Users will have the ability to filter parts for selection.
UI should be loosely based on our current erp system.

Milestone 1: establish scope of project
Project name : GOOSe
Milestone 2: create wireframe of system of UI
Candidate will provide a graphical UI of the GOOSe
login screen
part creation/selection
part modification
configuration creation/selection/upcharges
Filtering of parts (user friendly)
custom configuration
order finalization - send to erp

Candidate will provide demonstration of wordpress connectivity to system

Milestone 3: build prototype
Milestone 4: Successful beta test
Milestone 5: Move to production