Hi Stephen,
From what I understand, the full schema, e.g. in a .vsd, for PODS would likely only be available to PODS members, although views of the logical diagrams are available in the Downloads at: http://www.pods.org/downloads/
Another pipeline model you may want to look at is APDM:
FAQ: http://apdm.net/about.aspx
Downloads page: http://apdm.net/downloads.aspx
The downloads have all of the available design documents, including .vsd. I recommend that you download the 4.0 version whitepaper which provides context. You�??ll find it on the right side of the page.
Regards,
Chris