I am trying to respond from QA principles stand point, i am no expert in the industry you mentioned....
as i understand your query....you are looking for deliverables & KPI for establishing QA for Incoming materials.
First Deliverables...(implementation & execution front)
* ought to establish an in-house quality attributes (QC) for each of materials. (may be you can prioritize with category of materials)
* convey QC requirements to respective vendors, and receive a certificate of analysis for each batch/lot
* device a sampling plan & release of material for operations
as per KPIs...
operationally...(Implementation & Execution front)
* Lead time for clearing a material.
* Rejection %
Strategically...(planning)
* reduction in no. of rejections ( vendor development)
* alternate vendor
hope this helps...